A guy I was bowling against in a final of a local tournament did the same kind of thing. I was behind by 41 in the 5th - he was hitting high and crumbling splits, and carrying brooklyn. I was hitting flush, but leaving corners. I was able to stay in my game, and not worry about him.
He finally left a big 4 - decided to show off and try to make it - missed all of 'em. Then he got frantic, and left a couple more opens. I finally started carrying, and beat him for the game, match, and tournament win.

He was so angry that a "girl" beat him, he never came back to the tournament group.
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