User blog comment:Xilinoc/Ch. 635 - Hooded Enigma/@comment-44061-20150715155754/@comment-5398287-20150715161023

From what I can gather, he's picking them off when they're away from the group and no one will notice them falling, and presumably he's going for lethal damage, which no one beyond Orihime can repair. Hopefully, he'll be smart enough to start aiming for the healers themselves as well.