User blog comment:I HEART TWILIGHT SAGA/Jasper/@comment-66.56.220.44-20090831021451

I'm going to guess because we he was "in the zone" so to speak, going to kill James. He was a soldier, and soldiers are trained to focus all of their will on the task at hand. It's possible he was so fixated on tearing James to pieces that it just didn't cross his mind.