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Both the stratagem Wall of Mirrors and the Homing Beacon carried by Stealth Suits use the phrase "At the start of your movement phase", which I read to mean before the following actions detailed in the BBB:

Start your Movement phase by picking one of your units and moving each model in that unit until you’ve moved all the models you want to.

The question is can I first use Wall of Mirrors to redeploy the Stealth Suits, and then drop the Homing Beacon?

Here's the the two quotes in full:

Homing Beacon: A homing beacon may be used at the start of your Movement phase by placing it within 1" of its unit.

Wall or Mirrors: Use this Stratagem at the start of your Movement phase. Pick a <SEPT> XV25 STEALTH BATTLESUITS unit from your army that is within 6" of a <SEPT> XV95 GHOSTKEEL BATTLESUIT from your army. You may immediately remove the Stealth Battlesuits unit from the battlefield and set it up again, anywhere within 12" of that Ghostkeel Battlesuit and more than 9" from any enemy models. Note that this does not count as Falling Back if the Stealth Battlesuits unit was within 1" of an enemy unitwhen it was removed.

They both happen "at the start of your Movement phase", and since it's your turn, the sequencing rules allow you determine the order they are resolved in. So yes, you can use the stratagem first, then the homing beacon.

There was some question as to whether using the strat counts as movement and thus "Starts the movement phase" and so obviating the use of the Beacon that turn.

 Fenris-77 wrote:
There was some question as to whether using the strat counts as movement and thus "Starts the movement phase" and so obviating the use of the Beacon that turn.

It doesn't, it is used at the exact same time as the Beacon is used, thus Sequencing rules come into play. If you deploy the beacon before using the stratagem then it's literally not the beginning of the movement phase anymore.

For once I agree with BCB over rules.

 BaconCatBug wrote:

 Fenris-77 wrote:
There was some question as to whether using the strat counts as movement and thus "Starts the movement phase" and so obviating the use of the Beacon that turn.

It doesn't, it is used at the exact same time as the Beacon is used, thus Sequencing rules come into play. If you deploy the beacon before using the stratagem then it's literally not the beginning of the movement phase anymore.

Sorry, haven't had my morning coffee yet, why would dropping the beacon first start the movement phase but using the stratagem wouldn't?

 Fenris-77 wrote:

 BaconCatBug wrote:

 Fenris-77 wrote:
There was some question as to whether using the strat counts as movement and thus "Starts the movement phase" and so obviating the use of the Beacon that turn.

It doesn't, it is used at the exact same time as the Beacon is used, thus Sequencing rules come into play. If you deploy the beacon before using the stratagem then it's literally not the beginning of the movement phase anymore.

Sorry, haven't had my morning coffee yet, why would dropping the beacon first start the movement phase but using the stratagem wouldn't?

What I am saying is if you resolve the beacon first, before declaring the stratagem, it's no longer the start of the movement phase. You have to declare the stratagem before resolving the beacon, then decide how to resolve them via the sequencing rules, otherwise it's too late.

 BaconCatBug wrote:

 Fenris-77 wrote:

 BaconCatBug wrote:

 Fenris-77 wrote:
There was some question as to whether using the strat counts as movement and thus "Starts the movement phase" and so obviating the use of the Beacon that turn.

It doesn't, it is used at the exact same time as the Beacon is used, thus Sequencing rules come into play. If you deploy the beacon before using the stratagem then it's literally not the beginning of the movement phase anymore.

Sorry, haven't had my morning coffee yet, why would dropping the beacon first start the movement phase but using the stratagem wouldn't?

What I am saying is if you resolve the beacon first, before declaring the stratagem, it's no longer the start of the movement phase. You have to declare the stratagem before resolving the beacon, then decide how to resolve them via the sequencing rules, otherwise it's too late.

I understood what you said, I'm just not clear why that's the case. I'm not trying to be a pain here, but why does placing the beacon start the phase but not using the strat? Maybe I'm missing something fundamental about sequencing. The rule from the BBB doesn't seem to rule out placing the beacon and then using the strat since they both happen at the start of the movement phase".

I feel like I'm going to facepalm once I get what you're trying to say.

 Fenris-77 wrote:
I understood what you said, I'm just not clear why that's the case. I'm not trying to be a pain here, but why does placing the beacon start the phase but not using the strat? Maybe I'm missing something fundamental about sequencing. The rule from the BBB doesn't seem to rule out placing the beacon and then using the strat since they both happen at the start of the movement phase".

I feel like I'm going to facepalm once I get what you're trying to say.

Example: The movement phase starts, and without declaring the stratagem, I resolve the homing beacon effect. As soon as I have finished doing that, it's no longer the beginning of the phase.

In order for you to use the strat before the beacon, you MUST declare the stratagem at the start of the phase, likewise declaring the beacon at the start of the phase too. The sequencing rules then kick in.

If you resolve the beacon first without declaring the stratagem, it's too late to do so. You can, of course, choose to resolve the beacon first via the sequencing rules. It's a subtle but important point.

The sequencing rule, to my understanding, just allows the current player to decide on what sequence the start of the movement phase rules are resolved. They only resolve "at the same time" if they are unrelated and don't influence each other. Because you want the beacon to be placed at the new location of the suits, you need to decide that you resolve the stratagem first and then resolve the beacon rule. Since there is no clear definition of what the start of a movement (or any other phase for that matter) is, my understanding is that it is the start of the phase as long as no unit has completed it's movement. But when using wall of mirrors, you teleport, which triggers the Reinforcement rule and makes it so that unit has completed it's movement phase and counts as having moved for all rules purposes. So does this movement end the start of the movement phase or does it not?

It does not, because the movement phase begins when a unit moves conventionally. Reinforcements arriving at the beginning of the turn don't start the movement phase. I think.

liverscrew wrote:
The sequencing rule, to my understanding, just allows the current player to decide on what sequence the start of the movement phase rules are resolved. They only resolve "at the same time" if they are unrelated and don't influence each other. Because you want the beacon to be placed at the new location of the suits, you need to decide that you resolve the stratagem first and then resolve the beacon rule. Since there is no clear definition of what the start of a movement (or any other phase for that matter) is, my understanding is that it is the start of the phase as long as no unit has completed it's movement. But when using wall of mirrors, you teleport, which triggers the Reinforcement rule and makes it so that unit has completed it's movement phase and counts as having moved for all rules purposes. So does this movement end the start of the movement phase or does it not?

The Stealth Suits count as moving, but haven't actually moved according to the rules of the movement phase. I don't see why you can't declare both, drop the beacon, and then move the suits via stratagem. The phrase "May not move or advance" isn't the same as "completed it's movement phase". By your logic, if a previous effect prevents any of my units from moving in my movement phase (via the phrase May not move or advance) then I would also be unable to place the beacon because they have "completed their movement phase".

The phrase "may not move or shoot" removes that unit as a option during the movement phase, which is to say that you cannot select them "by picking one of your units and moving each model in that unit until you’ve moved all the models you want to." (BBB) That's not at all the same thing as saying they have actually completed a move, which I don't think they have.

 Fenris-77 wrote:

liverscrew wrote:
The sequencing rule, to my understanding, just allows the current player to decide on what sequence the start of the movement phase rules are resolved. They only resolve "at the same time" if they are unrelated and don't influence each other. Because you want the beacon to be placed at the new location of the suits, you need to decide that you resolve the stratagem first and then resolve the beacon rule. Since there is no clear definition of what the start of a movement (or any other phase for that matter) is, my understanding is that it is the start of the phase as long as no unit has completed it's movement. But when using wall of mirrors, you teleport, which triggers the Reinforcement rule and makes it so that unit has completed it's movement phase and counts as having moved for all rules purposes. So does this movement end the start of the movement phase or does it not?

The Stealth Suits count as moving, but haven't actually moved according to the rules of the movement phase. I don't see why you can't declare both, drop the beacon, and then move the suits via stratagem. The phrase "May not move or advance" isn't the same as "completed it's movement phase". By your logic, if a previous effect prevents any of my units from moving in my movement phase (via the phrase May not move or advance) then I would also be unable to place the beacon because they have "completed their movement phase".

The phrase "may not move or shoot" removes that unit as a option during the movement phase, which is to say that you cannot select them "by picking one of your units and moving each model in that unit until you’ve moved all the models you want to." (BBB) That's not at all the same thing as saying they have actually completed a move, which I don't think they have.

Well, the Reinforcements rule says the unit uses up their movement phase for this turn, not just that they can't move/advance anymore. I think GW just left too much for interpretation in this case, I don't know if there are any rules like this in other armies so maybe they just didn't think of this interaction when designing the rules, IMO this warrants an FAQ. I essentially treat all teleports as replacing the unit's movement value with the special rules outlined in the used ability, which I think is the default intent of GW, but I am not sure if there are any cases of armies having this kind of movement at the start of the movement phase that also interacts with other rules. Quoting rules with marked sections that are relevant IMO:

Many units have the ability to be set up on the battlefield mid-turn, sometimes by using teleporters, grav chutes or other, more esoteric means. Typically, this happens at the end of the Movement phase, but it can also happen during other phases. Units that are set up in this manner cannot move or Advance further during the turn they arrive –their entire Movement phase is used in deploying to the battlefield – but they can otherwise act normally (shoot, charge, etc.) for the rest of their turn. Units that arrive as reinforcements count as having moved in their Movement phase for all rules purposes, such as shooting Heavy weapons. Any unit that has not arrived on the battlefield by the end of the battle counts as having been destroyed.