1. What's his AF?
2. Has he done this before?
3. Have you seen him showdown top pair? If so what was his line?

If 1 is low, 2 is no, 3 is not raise, then fold.

If he's tricky/aggressive and plays 1 pair hands or draws aggressively I call.

Carroters a loose/passive played check raising the turn screams set or 2 pair so we don't need a river shove to justify it, that's why I think calling against this type of player is a spew even on the turn.

The line he took is pretty strong so that's why I fold the turn. If I see this player do this again I'm going to be more suspicious next time and probably call it off.