Now you're wrong: the "chased" him into First Class AFTER he ran down the aisle saying he had a bomb in his bag.
Read the post I was responding to. That person's theory is that he was running off the plane to get more time to detonate the bomb.
My point was that he was only chased because he was making a commotion that was perceived as threatening. He wasn't being chased because he was caught in the act of trying to detonate the bomb.
Since most passengers who board an airliner have to traverse first-class to get to coach, it stands to reason that he would run up the aisle and through first-class to get off the airplane, does it not?