Apparently Jackson Rathbone was injured, though not seriously, during Eclipse filming earlier this week. According to MTV:
…according to a statement from a rep for the film, he’s doing fine now. “Actor Jackson Rathbone of ‘The Twilight Saga’ movies was slightly injured yesterday [September 22] during a fight scene rehearsal,” the rep told Access Hollywood. “As a precaution, he was driven to the hospital and checked out by a doctor. He’s fine and is back at work on the set of ‘Eclipse’ today.”
Between that news, and Ashley Greene’s recent, and visible bruising (which she talks about in the same article) Eclipse is shaping up to be the most dangerous of the saga. But we already knew that.