Heh, it takes some time to figure out since most of my minions look pretty similar to if not more grotesque than the baddies. I used to blast away at those skeleton mimics every time they'd spawn (which is pretty much always).
Typically in a medium-large fight I'll have 12+ minions running around, more if there's a large group and I'm able to focus the firebats on them. And those daggermidgets can add up pretty quick. I can go from 0 to 6 midgets in 7 seconds flat on a good day.