"Yes," muttered Sam, "but no."

"Well, that's about as clear as mud. Think you could clarify?"

Sam huffed. "What I mean is, one of us has to get tied to the altar while the other," the younger Winchester hesitated, "the other…carves the sigils in a few places on his body."

"Gee, sounds downright cozy. And?"

"And it's all the steps right up to the sacrifice, but we shouldn't have to do the sacrifice itself."

"Mmm, comforting. I'll do it—the altar thing. You do the carving."

"Dean…"

"You're better at the sigils anyway. Just make sure the knife is sharp."