I'd stay in the group. Strength in numbers and all. We band together, mob the guy, use his weapons against him, and come out the victors. More people means more brawn, more brain, more collective resources. If we go one by one, we're more likely to be vulnerable to attack, being snuck up on from behind, trapped somewhere, etc., and then we wouldn't have any allies to back us up.
Really there's no reason to split up, if you think about it. Who's to say we don't all survive as a group?
WYR live in a dark house or one with too many lights/windows?