Looking at just the price chart over the last little while, the sideways movement that started in mid-Oct and interrupted the nice little uptrend that started at the end of July showed signs of reversing when the $80 support area turned into quite a neat resistance over the previous 7 trading days. From what I can see, if there was going to be a big move (esp. on an earnings announcement) the price chart indicated on recent activity that it would be down.
I know this doesn't answer the question of 'why' given it beat estimates, but the last few days suggested an upside breakout was unlikely.