Was playing against Chris' dark eldar today and a weird situation came up. Here's the set up.

Chris and I have a unit of assault marines and tac marines (mine) in assault against a unit of witches, bloodbrides and Lellith. In his assault phase he clears out enough room in the center of the assault for lysander and a unit of assault marines to pile in. Now here's were it gets hinky. I positioned lysander so that he would be guaranteed to move first in my assault phase and to engage lellith. In the subsequent pile in move there was only a big enough gap between my already positioned tac/assault marines and lysander to get one more terminator into b2b contact. In that gap my terminator was able to engage an unengaged bloodbride (which he is forced to pursue due to the assault rules), but also was able to be in b2b contact with lellith at the same time, relegating all 4 of my other terminators to non-b2b supporting attacks. My question is this, in the pile in move, is the one terminator who was able to make b2b contact with the bloodbrides allowed to contact lellith (who was already engaged by lysander) thus allowing the other four terminators to parsel out there attacks between the IC and the bloodbrides as I wish (due to them being within 2in of a model in b2b with the ic and the squad), or does that one terminator have to choose to be in b2b with the IC *or* the bloodbrides, thus forcing me to put the attacks from the entire ***. terminator squad on either the IC or the blood brides.

Thanks guys.