If they're hiding behind trees then they shouldn't be spawning in my face or inside of their comrades. When I send my team off to attack one point, and charge 3 bandits by myself, which magicly turns into 7, that's not fun. Have them spawn a short distance away at least, not right on top of me. I like Ibo's idea, once the lair is alerted to your presence, it makes sense that they would muster to repel you. And yes I forgot to mention in my OP that having to run back and forth between spawn points, playing whack-a-mole, is not fun either. At least it's good XP for these things.