A doppleganger... [Ed repeats that to reflect on it. He'd heard about them, but considers himself lucky that he hasn't come across any he'd recognized yet.]

It's not looking so. I guess we don't have any choice but to move on. Not a lot we can do about it, I'm afraid.

[He looks down at the unassuming door, a feeling of dread creeping up on him further.]

Only one way to go, too.