The 'bang' makes Sam jerk, hand going to the small of his back. Where he isn't carrying a weapon because they're in the bunker, but he's a Hunter. Loud noises make him jumpy when he's relaxed.

He snorts at Gabriel, rolling his shoulders to release some of the tension before crossing into the kitchen to kiss both Gabriel and Jessica. "I'll go talk to him. Let him know where we're going and that Gadreel will be able to get hold of you if we're needed." And, honestly, he might suggest that his brother take Jo and Gadreel and get out of the Bunker (and Kevin's hair) for a while as well.