He presses the lock on the keys just as he throws the sheet out of the door. Several shots ring out, but they only hit the sheet. Sherlock makes a run for it.

His own feet are also bare, and he thinks of his shoes and his coat and everything behind them. Rebuilding is what they do best, the two of them. He spots the sniper from where he'd been hiding, but he pulls back his gun as Sherlock looks.

What? Why would he pull back his gun now?