Clint Hurdle makes a lot of questionable moves. One of them was pulling Jeff Francis and allowing Matt Herges to face Chris Young.
In Hurdle's favor: Francis has already thrown a full game. Plus, traditional wisdom says you want a right handed pitcher facing the right handed batter.
Against Hurdle: Francis is a much better pitcher than Herges. He's a Cy Young candidate. Herges is a journeyman.
More importantly, check the stats Clint! Chris Young does not hit lefties well, and his power numbers are much better against righties. He hit home runs against lefties half as often as he hit homers against righties.
Hurdle got away with it because Young only walked, and Drew then flied out. I'm not sure how many of these Hurdle can get away with in the postseason, though.