Sherlock steps back when he sees the colour drain from John's face. He's not a doctor but knows exactly what that means. He manages to step out of the firing range and save his jacket, at least. Unfortunately, the laws of physics dictate that his trouser legs and shoes would be caught by ricochet.

He gives the mess a disgusted sort of look before stepping around it and going to correct John's lying posture. He needs to be on his side, not his stomach or his back. He also needs to elevate his head a little more than he is. There, much better.

"Water?" he asks simply as he tugs John's foot blanket out from under him so he could at least cover him with something.