Mike, 12 does indeed miss, 1d20+2=11 (perception roll for Hellknight noticing your arrow) - Let's say your miss was bad enough that the Hellknight did not even notice you shot at him. Dru stays put.
Hellknight #6 perception roll(1d20+2=4), is oblivious to the rest of your group.
Hellknight #2...