Gordon Walker had captured Sam and Dean to use as bait so he could kill you due to your powers and thinking you're a monster. He was sitting in a chair with Sam and Dean tied down in other chairs.

Dean: "You think our buddy's stupid enough to fall for a friggin tripwire?"

Gordon: "No. I don't. Especially since I'm sure you found a way to warn them. He chuckles. "You really think I'm that stupid?"

Sam: "Maybe."

Gordon: "They're gonna scope the place first. See me covering the front door, so they're gonna take the back. So when they do, they'll hit the tripwire."

Sam: "They're not falling for a tripwire."

Gordon: "I know. That's why I have a second one."

Just then, they all heard footsteps and Gordon quickly used cloths to gag Sam and Dean before taking his position.

Gordon: "Ya hear that...? Here they come..."

Both tripwires go off, making Sam and Dean worried, grunting under the cloths as Gordon began to investigate.