The doctor tells David that he's too close to the train and that he needs to get rid of the bomb before it starts going off. David says he'll do it for him, but he can't tell if it's going to blow off his arm or not. The doctor says that if the bomb goes off too soon, they'll all be "blasted" . David tells the doctor that he doesn't want to go back, but the doctor says they can get him a new ticker if he needs it. David and the doctor argue about whether or not they should throw the bomb away, but David says they should just leave the woman on the train. He's done arguing with David, and they're heading back to their hotel.