Just throwing this out there. I can't remember if it was already said.

Has anyone noticed that in the beginning, they passed up Michael to attack the guy who was being noisy behind him? Yeah, the other guy drew attention to himself, but Michael says "Something inside me told me not to move" and they ignored him to kill someone else. In Chapter 10, Kalani was out (or faking it) and they passed him up to get Samantha instead (who was also drawing attention to herself). She initially told Datu to "Freeze" and to just trust her. Perhaps movement plays a role in who they attack.