If anything, Sinclair knows an empty threat when he hears one. He just wishes he had the full story here, maybe he could understand what exactly is making Jack so angry. How it happened.

But he nods in agreement, although he doesn't particularly trust this place to have a safe spot for him to wait out Jack's Big Daddy battle. But he's got a chemical thrower now! Burn everything that comes too close! Reminding himself of that, he follows close behind Jack, listening for the mournful groans of the nearest metal man.