Fred wasn't never too far behind no matter where FP went. Even if it was just to the front door. Oh, he'd tried to get him to leave but it hadn't happened. He'd decided to stick with his Serpent. He knows that his boy wanted to do the same, but he couldn't let him get sick. They'd have to get the house cleaned up anyway.
Once Cobra is laid down he follows FP and Connor up to Jughead's room, leaning against the doorjam. His eyes watch the good doctor even as he pulls his knife out and twists it against the tip of his finger.