Probably the zombie that's falling alongside him?

Ace is displaying an absolutely horrendous lack of familial feeling and is not coming to Raven's rescue, the cookie's rescue or... anyone else's rescue either.

Mostly because the little birdy was kicked upside the head by a flailing, falling zombie, and it's hard to come to anyone's rescue when unconscious.

Bad excuse, we know. She'd apologies if, you know, she was awake.