This wakeup is odd (I wouldn't be terribly surprized to see A5 here from a bad player).. When bad players make odd raises on the river warning bells goes off in my head, especially if he is moderately aggressive.

Exactly what I was thinking. I usually try to get as much money in with straights and flushes against poor opponents, even on paired boards, because I know they can't let go of trips. But this check-raise really threw me off.

Dumle