It's a delayed reaction, his disbelief becoming more evident as Dan details out his efforts. Proof of the supernatural, or evidence of obsession with a very dubious root in reality? If they had discussed this as strangers, he would have certainly leaned towards the latter.

"Let's back up for a second."

This is a lot to just accept all at once. He glimpses at the paper map under the glare of the flashlight.

"Okay. You're telling me you found monsters in the woods, for one. Bulletproof monsters, scurrying around in packs, in a forest that teleports you around like you're in a video game. With magic, I suppose?"

He makes very firm eye contact with Dan, obligated to at least point out how insane this all sounded.

"And now you're hoping we can capture video footage of the things? Am I getting all this right?"