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So after reading the SfD and some initial reactions from the community, there seems to be a lot of contradiction/confusion (at least to me).

So what does "as if it were your movement/shooting/assault phase" interacts with your actual phases?
Is it as if it was your previous/current/future movement/shooting/assault phase or a stand alone phase with no correlation with your phases?

Some questions on how to resolve SfD in these specific scenarios:

A single windrider moves onto difficult terrain during your movement phase and failed its dangerous test and armor save within 7" of another unit of windriders that has not moved yet. The unit of windrider activates SfD and chose to move/shoot. Can the windrider unit still move/shoot during your turn?

A unit of jetbikes turbo-boosted on your movement phase to grab an objective. On your opponent's turn, he/she destroys a unit. The jetbike that turbo-boosted the previous turn activates SfD. Can they shoot/assault?

A unit of warp spiders successfully activates hit and run and disengage combat during your assault phase. A close by Ynncarne destroys a unit of tactical squads in CC (still your assault phase) and the warp spiders activates SfD and successfully charge the same unit it disengaged, how will you resolve that combat?

Any clarification backed up with rules quote would be much appreciated! Thanks!

If you choose them to move, then no they cannot move again as they have already moved that movement phase. It is as if it were your movement phase, but is also your movement phase. So shooting makes sense...
You turbo during the shooting, not movement, phase. But turbo only stops you takin other actions that turn, meaning player turn. So yes a soul burst action could take place the next player turn just fine.

Your examples have some errors built in. Jetbikes cannot run, so they do not benefit from Battletrance, plus that happens in the shooting phase. Just like turboboosting.

You have three options, so even if one of rhem is blocked because you happen to be in that phase and you already took the option or would be unable to take it again later, you can still use one of the others.

Generally, effects last for a phase, a player turn or until the phase starts the next time and thereby run till a fixed time in the game. Determining if they are still up should be doable.

My mistake regarding the jetbike turbo- boosting and they lose battle focus due to gaining SfD. Let me rephrase the jetbike:

On your your shooting phase you turbo- boosted 1" away from an enemy unit. Another one of your unit destroy that enemy unit. Jetbikes activates SfD. Can they shoot/assault?

I do not believe you can. Once you have Turbo-boosted, you can no longer perform voluntary actions "that turn".
Soulburst allows you to do actions even if you have done them, but it does not allow you do action that you cannot do "if it were your X phase"
So if you shot this turn with a Heavy/Rapid fire weapon, you may not use a Soulburst to assault.

You could, however, move close to a unit, shoot it dead, then use a Soulburst to Turbo away. Or Turbo near a unit, and in THEIR turn perform whatever Soulburst you want if a unit dies near you then.
Essentially, you need to be eligible to perform the action for Soulburst to allow you to do it.

Another thing to note, is that using Soulburst to charge only allows you to charge. It does NOT allow you to attack twice.
So if you wipe a unit in assault and use the Soulburst to assault another unit, you are considered to have already attacked (and thus the new combat resolves at whatever Initiative you left off at). This is very important to remember as you may charge in and now your enemy gets free attack on you.

-

I think the two important phrases from SfD are:

"As if it was your [movement, shooting, charge sub] phase"
and
"Even if [the unit] had already done so this turn"

So, when deciding what you can do, first ask question 1:
"If it was my movement/shooting/charge phase RIGHT NOW, could I take this action?" If the answer is yes, go ahead.

If the answer is no, ask the second question: "Is that solely because the unit has already done this action this turn"? If the answer is yes, go ahead, Soulburst let's you do it again.

Lets apply these to examples from the OP:
A single wind rider dies (and he was the only model in his unit), triggering a soulburst action in a unit of windriders 7" away, as they have SfD. The important thing here is that it is currently your movement phase (as you said). In this example, you chose to move as your soulburst action.
Q1: can they normally move in your movement phase? Yes, go ahead.
In your next movement phase you can also move, unless something is stopping you.
Say instead, you chose to shoot in that movement phase.
Q1: can they normally shoot in their shooting phase? Yes, they didn't do something like turbo boost or something to prevent it. Go ahead. However, when it comes you your ACTUAL shooting phase (next phase), and you want to shoot, the BRB says you can only shoot once per turn, bear that in mind.


Example 2:
Jetbikes turbo boosted in your turn, and now it's the opponents turn and you want to soulburst.
Q1: could I turbo boost if it was my shooting phase RIGHT NOW? Yes, turbo boosting prevents the unit from taking any other voluntary actions until the end of my turn. BUT, it's now the opponents turn, not mine.

Example 3:
Warp spiders used hit and run in your own assault phase to get out of combat. By definition, it is currently the fight sub phase of your turn, because you have used hit and run, which happens after combat. Can you charge the same unit you broke off from just now?
Q1: Could I charge if it was my charge sub phase RIGHT NOW? Unless you are disallowed (gone to ground, came in by deep strike, already locked in combat etc - more examples are given in the BRB), yes you can. As long as you are in range of a charge - that's another requirement of charging. If the rulebook had said you can only charge once a turn this would be different, but it doesn't say that iirc.

Let's have one more example (that you didn't give), so we can bring question 2 into use:
In your shooting phase, you shot a unit with your dire avengers. In your assault phase of the same turn, a unit dies within 7" of your dire avengers, and your dire avengers have SfD. You decide you want to shoot with your dire avengers as your Soulburst action.
Q1: If it was my shooting phase RIGHT NOW, could I shoot with them? No, you can only shoot once a turn, and you've done so already in this turn.
Q2: Is the reason you can't take this action solely because you have already taken this action previously this turn? Yes - I didn't go to ground or whatever else that prevents me from shooting. Soulburst allows me to do this action even if I've done it before this turn.

I think these questions help to resolve some Soulburst situation questions, but feel free to come up with your own scenarios to test these questions, maybe they don't always work

Hmm. Eldar flow charts. Well, this certainly comes to mind: