Monster detection skipped dead monsters during fmon traversal but
found semi-dead guard parked at <0,0> waiting to remove temporary
vault corridor. If that happened to be the only monster found then
the feedback was incorrect (a blank map showing no found monsters
instead of a strange feeling). Object detection found semi-dead
guard's inventory and might report incorrectly too although the
chance of that being the only objects found on the level is a lot
less than it being the only monster.