Without smart tactics or voice chat, the overwhelming level of adversaries - that come from all angles - will bring your group to their keens. If the enemy doesn't see sneaking high on him from behind or his side, then the guy can not cry in the market to alert his comrades nor will he have a very chance to fireplace his weapon. Of course, as with perfect story telling, Flynn double crosses Drake after the they get their hands on the oil lamp and leaves Drake to handle the security officers on his own.