[Pokerfarian]

Very tricky spot. Default is probably check behind, but in a 3R I can see him calling a bet with Ax here a decent amount. Overall, I think it's very close but I like a bet because I don't see much that you lose to except a flush draw & he donks that a lot on the river, whilst this + river call of a ~20K bet is a fairly "standard" line for 3R players to take with Ax. Having a table image of a maniac might be the thing that slightly tilts it this way, I certainly wouldnt need much of a read the other way to check behind.