Transformation Guns: Mrs. Watson Gets Shot

Just at that moment, a little ways down the hall, a student found another transformation gun. Somehow, it had gotten into the student's locker. And turning it around in their hands, the student accidentally shot it off, hitting Mrs. Watson directly in the head. The student began to panic, thinking that the teacher might have been seriously harmed in some way, but that's not what happened ... at least, not exactly. The moment the beam from the transformation gun hit the English teacher, she began to change. But which gun was she shot with?