Boromir, I don't know why the orcs leave either (other than that it looks scary in the movie), but whatever it is, it's the same reason that the Witch-king didn't kill Gandalf in ROTK EE but instead flew off to "see who's blowing horns at this hour of the morning."
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"If you're referring to the incident with the dragon, I was barely involved. All I did was give your uncle a little nudge out of the door."
THE HOBBIT - IT'S COMING
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