I didnt vote on this, purley because im not sure.
Part of me thinks, why would you not check your bed for your girlfriend ? And if you were disabled would you actually leave the room, I think I would stay put and shoot them if they came in.
Another part says, well, if it were late at night, then maybe she didnt flush, to not wake him, and an intruder might have sought safety in a locked bathroom, if he thought he'd been foiled.
his story holds up, with gaps in his logic. Maybe shout, then shoot?
Interesting to see what they decide though.