Looking through the play by play log of the game, I think Cora's move there was eminently logical. Schwarber had singled on his previous AB. In the 6th Houck had retired the 2 RH batters and given up a hit to the LH batter. Now here comes one of the most dangerous LH batters in the game with a chance to turn it from a 1 run game to a 3 run game. Plus, Bleier only has to get one out because it'll be the last out of the inning. Totally sound move with lousy results.
Also, we could really use a better lefty in the pen.