"I don't know," he says. "I don't know how any of it works. The same thing happened to me. One second I was in the Upside Down, that's what they call this other version of Hawkins where Vecna lived. I was fighting off these bats things, just covered in goo and blood and-"

He pauses here, leaning back and lifting up his shirt. The worst wound is still bandaged, but there are others, clear bite marks, pink and healing.

"Anyway," he says and drops his shirt. "The next second I was here. With some bats. The hospital had an envelope just like yours with my name on it."