i didn't say i was solo'ing them...i said i was hitting them ...not a miss, an actual hit with damage (then running to a guard to have him take it down).
oh, ok. That makes a lot more sense!
You will aggro mobs as soon as you attack them, though. You don't actually have to successfully hit them. To get credit for mobs killed by guards, you have to do enough damage so that the mob is aggro'd to you when it dies.