These aren't like the imaginary animals from before. These are real. He can see the holes burning through a large gorilla-like thing ambling towards them, but at least three times the size of one. He can smell it.

He turns in place to check on Raven, but given that he's whistling he can't immediately call out to her.

So he just flails his hands gently in her direction, trying to get the group to fucking go. They don't have time to wait around and gawk, and they need to leave.