He's a bit further away when he first hears the screaming; but since Poe takes the time to pause and admonish the nervous-looking townsfolk, Finn comes barreling around the corner in time to catch him. At first, it seems like he's just going to go plunging straight into the woods by himself. He skids to a stop at the last second, though, and turns to regard the man who is currently questioning the bystanders.

His face works through a visible display of the thoughts going through his mind: Hold up. What the hell? I know this guy. Holy crap! What's his name---? Poe? It's Poe!

A portion of the fog clears in his memory, and despite the terrible screaming coming from the woods, Finn is so glad to see him. "Let them be, come on! We need to go, now!"