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Can units that have broken coherency perform an assault move? The rules for performing an assault require that the models in question retain coherency, but offer no insight into the case in which coherency is already broken.

In particular, consider what happens if a singular model has been separated from its parent unit and then surrounded by a cadre of enemy models, such that none of the enemies are within 1" of the isolated model, but there is no gap sufficiently large for the model to move between them to rejoin its parent unit. In the movement and shooting phases, the model must obey all rules pertaining to movement and unit coherency, including the prohibition against moving within 1" of enemy models. This would prevent it from regaining coherency in the movement or shooting phases. But what about the assault phase? Can a unit lacking coherency engage these intervening models in assault?

If there is not a rule stating they can not, then, as per the assault rules, they may launch an assault.

Well, the new Space Wolf Wulfen aside, most models can't run and assault, and it seems that the unit is required to run in their shooting phase.

But if even running can't restore coherency, do they still have to make a run move?

Moreover, the assault rules require that the assaulting models retain coherency as they assault. The rules give rules on how to perform assault, but then place restrictions on doing so that may be impossible to follow, given a broken coherency.

I don't think it's as simple as you're saying.

Yes, they must still attempt to restore coherency by running.

But that doesn't necessarily mean that units out of coherency can't assault.

If a unit fires some plasma pistols and a few die to gets hot and they are out of coherency they can't run to restore coherency and there is nothing stopping them from assaulting.

Kaela_Mensha_Khaine wrote:
But that doesn't necessarily mean that units out of coherency can't assault.

If a unit fires some plasma pistols and a few die to gets hot and they are out of coherency they can't run to restore coherency and there is nothing stopping them from assaulting.

Correct. In this instance, they would be allowed to assault. They would have to finish their assault move in coherency, though.

 Kriswall wrote:

Kaela_Mensha_Khaine wrote:
But that doesn't necessarily mean that units out of coherency can't assault.

If a unit fires some plasma pistols and a few die to gets hot and they are out of coherency they can't run to restore coherency and there is nothing stopping them from assaulting.

Correct. In this instance, they would be allowed to assault. They would have to finish their assault move in coherency, though.

Or as close as they can, at any rate.

Charistoph wrote:

 Kriswall wrote:

Kaela_Mensha_Khaine wrote:
But that doesn't necessarily mean that units out of coherency can't assault.

If a unit fires some plasma pistols and a few die to gets hot and they are out of coherency they can't run to restore coherency and there is nothing stopping them from assaulting.

Correct. In this instance, they would be allowed to assault. They would have to finish their assault move in coherency, though.

Or as close as they can, at any rate.

Negative. When making a charge, the unit must end it's charge in unit coherency.

Page 46 of the BRB, under the section where you are moving other models in the unit other than the initial charger. There are three rules it must follow (paraphrasing):

1. charging model must end it's charge move in unit coherency with another model in it's own unit that has already moved.
2. if possible, be B2B contact with an enemy model that is currently not engaged in B2B
3. If you cannot reach any enemy models, move to 2" horizontal or 6" vertically of it's own models that are in base contact. If impossible, maintain coherency.

Charging multiple units is similar for a multi assault. page 55:

"Remember that the charging unit is not allowed to break it's coherency, and this will obviously limit the potential for this kind of charge."

As far as say, losing a guy due to gets hot (losing coherency in the process), and then assaulting? Yeah your fine.

drz196 wrote:

Charistoph wrote:

 Kriswall wrote:

Kaela_Mensha_Khaine wrote:
But that doesn't necessarily mean that units out of coherency can't assault.

If a unit fires some plasma pistols and a few die to gets hot and they are out of coherency they can't run to restore coherency and there is nothing stopping them from assaulting.

Correct. In this instance, they would be allowed to assault. They would have to finish their assault move in coherency, though.

Or as close as they can, at any rate.

Negative. When making a charge, the unit must end it's charge in unit coherency.

Page 46 of the BRB, under the section where you are moving other models in the unit other than the initial charger. There are three rules it must follow (paraphrasing):

1. charging model must end it's charge move in unit coherency with another model in it's own unit that has already moved.
2. if possible, be B2B contact with an enemy model that is currently not engaged in B2B
3. If you cannot reach any enemy models, move to 2" horizontal or 6" vertically of it's own models that are in base contact. If impossible, maintain coherency.

Charging multiple units is similar for a multi assault. page 55:

"Remember that the charging unit is not allowed to break it's coherency, and this will obviously limit the potential for this kind of charge."

As far as say, losing a guy due to gets hot (losing coherency in the process), and then assaulting? Yeah your fine.

Nope, quite correct. From the Errata here:

Page 46 - Charge Move, Moving Charging Models
Change the first bullet point to read:
'‘If possible, a charging model must end its charge move in unit coherency with another model in its own unit that has already moved. If it is not possible for a charging model to move and maintain unit coherency, move it as close as possible to another model in its own unit that has already moved instead.’

So, yeah, "Or as close as they can, at any rate" is an accurate summation of the situation.