Regulus lets out a low sob when Sirius speaks, dropping onto his side so that he can cover his face with his hands. He just lets it happen, breathing raggedly and almost hyperventilating all over again. "Don't," he whispers, "it's not your fault, gēge. I should have been better. I should have stopped her sooner. I shouldn't have let her hurt you. Besides, I'm the one of us a Death Eater, I deserve it—"

He quiets and sits up again when Remus speaks, when he moves — he eyes the elder warily, ready to scramble back again if need be. He doesn't need to though, and snatches up his wand so soon as it's close enough. He holds it in a white-knuckled grip and then—lets out a crazy little laugh at the absurdity of it all.

He feels nothing. "What the fuck," he manages to spit, "makes you think that I'd want to kill you?"

It's patently clear he doesn't mean Sirius, either.

"I can't even fake a Cruciatus on someone I love, much less kill them."