[catlover]

Ace high is now a pair given the board.

But your point that Mason would get called a lot is well taken. On the plus side, if villian was planning to check raise the turn, he will now lead the river. This is good for Mason when he misses, because he avoids losing any more money. It's also good for him when he hits his gutshot, because he wins more money. It's only bad for him when he pairs.

Edit: The more I think about this hand, the more I think the right play on the turn depends on his opponent's turn check raise frquency.