Having him kill an innocent just to make him feel terrible would work well for me, especially as Yuuki is someone he's spoken to a fair bit in the past. So I'm totally game for that if you are.

Heehee, yeah, Zelos has realised that as she's a close friend of Fai's it's probably not a good plan to risk it. Either way, depending what Ishtar-mun does, Zelos will be very happy to go running around Nova City café-hunting with him.