this is quite a standard play by a reg at $25nl. Everyone knows that BTN is opening a wide range, so he wants to protect his blind. This is the fourth time he's done this in 30 hands???

You have A-J (but it really doesn't matter what you have). 4bet him to $9ish. He'll find it very hard to continue with the majority of his range.

If not, he's gonna keep re-rasing your BTN - I know I would.

as played, i guess float this flop, see what he does on turn. Obv continue if A or J drops. Maybe nit it up and fold to a 2nd barrel, though if I was feeling tricky and really thought the guy was doing it light, we could re-raise the turn whatever drops.