The house on Dreamhill Drive was a nightmare waiting to happen.

Outside, a minivan rigged with steel animal traps blocked the driveway. Near the home, a gate was booby-trapped to send a circular hot tub rolling toward anyone who opened it, like the boulder that bore down on Indiana Jones in “Raiders of the Lost Ark.”

Neither trap ensnared the bomb experts who visited the home in southwest Oregon last month, according to an arrest warrant affidavit. But the team ran into trouble inside, where someone nudged a wheelchair, triggering a loud explosion that sent shotgun pellets flying.

“I’m hit!” yelled one of the experts, an F.B.I. agent, according to the affidavit, part of a federal lawsuit against the home’s previous owner, Gregory Lee Rodvelt.

The agent, whose name was redacted from the document, had been shot in the leg. He was treated at a hospital, where an X-ray revealed a small pellet-shaped object below his left knee, and later released.