I've been thinking about this a bit.  If I may make a suggestion--each character has his or her own unique motivations for attempting to flee, fight, or surrender.  Since none of the characters really know any of the others yet, it's a bit hard to coordinate Out of Character as to what the group is going to do.<br/><br/>Might I suggest that everyone, regardless of what they do, gets rounded up and separated into two squad cars?  As GMs, you have the power of Deus ex Machina, so anything from a falling wall to a locked door to an inexplicable earthquake could be used to split the group in two; but to say that "all members from group 1 are going to try to run" or "all members of 2 will give up" is a bit like forcing our characters to go against their personalities or motivations.<br/><br/>For example, I don't see Tim or Brazil submitting meekly.  Phaedra or Sarah, however, may do just that. And yet, all of them are members of group 2.