It was intentional, but not flagrant, IMO. No harm intended, even tried to
hold the guy up, but there was just too much poundage to keep Karnowski off the floor. Either way, it could be debated as to whether it was a play on the ball or not. His arms were certainly in the vicinity of the ball, but just got arms instead, then followed through to prevent the bucket, likely a good decision once you've already committed the foul.