As the group walks out of the kitchen and into the sitting room, Ken says, "Oh, wait, we haven't tried that door over there yet. Don't I feel foolish." He pokes around the remaining door in a feeble search for traps. And while he's at it, he flips the carpet aside to see if there's a trapdoor underneath.
Ken searches for traps: The fang flips within the wastelands; blocks the roar of the spring!