"Sh, sh," Sirius said softly, leaning over him as Remus started to come to. "Moony, lay still, okay? It's Sirius, I'm right here, but I need you to be still for me. We were fighting at the Warehouse, and Bellatrix got you in the neck with a silver dagger. I brought you to Hemingway, and he's fixing you up."
He ran his fingers through the others hair again, leaving it at that. More detail could be given later, when he was feeling better and more coherent. "He's got a blood replenishing potion for you, that I'm gonna need you to drink. Then we're gonna take you to Hemingway's and settle you in, give you something for pain."
Reaching for the potion, he uncorked it and let Hemingway slide a hand under Remus' head, inclining it enough that he wouldn't choke. He placed the lip of the bottle to Remus' mouth, letting out a breath.