Um - if your gonna play the flush like that - you value bet - feeler bet the river. Paired board you have to know you're in trouble. IF you decide your getting your money all in no matter what with your nut flush then you gotta do it earlier - if ur looking for value and trying to avoid a cooler/knock out - you feeler bet it/block bet it at the river and trust your read (bluff or boat??) on him/her. But yeah bad all around.
Maybe i read it wrong but he was playing QQ and rivered a boat. The poster won the hand lol
Failing to Prepare is Preparing to fail : John Wooden