Dungeon23 Room 150 (The Shallow Dark)

Over here, not over there, over here where the rocky beach meets the cave wall, is the remains of a rock slide. Unremarkable by itself, if it weren't for the 7 Bowler (AC 4 HD 1D4+1 MMII pg.) hiding at the top of it. The Family Stone?

This is what happens when the dice indicate a Trick or Trap and you can't quite figure out why a trap located there hadn't been tripped already. I'm all for Gygaxian when I can get away with it, but that's a stretch.