[Tailgate is perfectly happy to help Robin out with this raft, even though there's no way he's going to be able to get on it. He's not worried though, he's sure one of his friends will pick him up sometime. Or maybe some ingress magic will teleport him back or however it works.

He picks apart some of the larger pieces of wood and puts them next to her. See, he's being helpful!]

What even happened here? Where are all the people?

[He asks, blatantly missing all of Robin's obvious signs telling him not to look at it or ask questions. Tailgate has never been one to leave things alone.]

And those wooden boat things out in the water! What caused that? I bet it was something wild.