could he possibly be playing AQ this way ?
they dont do this with AQ. They know that the double 4 pairing off makes a big Q look stronger. The pot is $80, he's betting near twice that. Very player dependant as he could deffo be playing QJ like this, hoping you have AQ and think you think your hand got stronger on the river.
I may be off-beam here, dunno but I hate the check on the turn
gives him the chance to fire on the river thinking you are weak/have c-bet with air..so puts you in an awkward spot with, I suspect, the best hand
bet on turn and you have far clearer idea of where you are if you face the heavy artilllery there
If I don't have him on a set (I don't) I am only really worried about QJ, given that I might call and chalk it up to experience (again, having like many others learned that overbets on the river are usually nuts from players trying to get max payment from a hand they haven't got enough into the pot with earlier!)
he should realise that you are not cbetting weak/w air against 4 other players on such a wet board. Checking turn keeps the pot smaller in a fairly marginal spot. Remember, you were CALLED by 4 other players preflop. QJ/44/JJ are my immediate concern, in that order. Sadly it doesnt work out in this example, but thats not to say it doesnt make more money on the river when you get an easy call and not an inflated pot with a 1pair type hand.