You would have thought he'd stunned himself, the way he freezes when Regulus hits the floor. He'd done that – him – and even the soft rustle that's the only accompanying sound to Regulus' landing seems to echo deafeningly in his ears.

He feels unsteady on his feet, like he might pass out himself until Sirius' voice brings him crashing back to reality once more. Remus whirls around, practically dropping his wand and Regulus' in his haste to get to Sirius' side. He's dropping to his knees and placing a firm hand on Sirius' shoulder to urge him to lay back, babbling almost incoherently with sheer relief:

"Sirius! Sirius... careful, don't push yourself. You've been hurt – badly. Just lie back, please. How's your head? No, stupid question, forget it just– Merlin, Sirius."