Jack's head snapped up just about the same time that Dan's had. He was still freaking out but... "I feel it already and I haven't flipped a switch." Not that he had too. He hadn't learned how to switch it off without booze.
Though the reminder of Dan's predicament brought on because he couldn't answer the door. Jack stepped forward, and touched the pad that would raise the door, but he was hesitant, like he was going to be shocked doing it.
He had to keep in his mind, that he wasn't going to find his son's body sprawled out somewhere. That only took an edge off the freak out just a little.