[robrobdoe]

Flop and turn look good. I don't think you should fold on the river. The lack of a preflop raise suggests they don't have two broadway hearts (likely for UTG+1, less certain for MP2), and so wouldn't be calling flop with overcards. The lack of a raise on flop or turn suggests no set or two pair which has filled up by river. The main worry is an A5/A3h straight draw on the flop, but it could just as easily be 35/36/56h. And it seems pretty likely that at least one player hit trip 4s. With the price you're getting (even assuming it's capped) I think you're ahead enough of the time.