Sam's sarcasm brought a deadly glare to John's face. His expression hardened at his youngest and he stared him down like a viper going in for the kill. "I hadn't thought of that. "His own tone icy and cold, but his focus switched quickly from Sam to the building where Mary was held hostage. "Pay attention." He started when his son brought up using himself as bait and his brows furrowed. He and Sam had never seen eye to eye, but that didn't mean he wanted to use him against YED and risk losing him ontop of possibly losing Mary.
"You get five minutes when we get to Mary, if you're longer Dean, I want you to leave your mother to me and get to Sammy. " His tone held that strictly no arguments tone he often used on the boys when he was younger and going away for hunts. Where they had zero choice in the matter. He knew Sam wasn't going to like it, but frankly he couldn't find it in himself to give a damn. His family's safety was what he cared about. Not what Sam wanted at that time. He knew later there was going to be an argument. He could feel the tension spiking between them.
It didn't take a genius to figure out that they had things to talk about, especially considering he shot Sam's girlfriend the last time they were together. But John glared at his kids instead of bringing up other issues. "Just keep your head straight in there." They weren't amateurs, but they were still his kids.