Sam thumbed a bit of gunk stuck to the edge of the table. When Dean didn't offer up any sort of explanation, after a fefw seconds of silence, Sam looked up. He felt like he was on the hot seat.
"Lucifer's back in the pit." He tried to smile, it came out more like a grimace. What he'd said was true enough, he was just hoping to skip all the unpleasant details. He ought to have known better.
"The Colt didn't touch him. In the end I said yes, but we had a plan, and there wasn't much choice otherwise. I said yes, and I put him back in his box. Now I'm back, and I'd rather not think about the rest of it."