Yeah, when I hit the thing, since it was completely submerged, I thought I snapped a shroud at first. Then 2 secs later it hit my rudder, and I drew the only obvious conclusion -- my boat and I were being eaten by a lake bound sea monster.

After nothing else happened, and sitting at a dead stop (from trapped out racing to the windward mark.) I moved on and came in last. When I came back to shore and the dagger was stuck I realized what happened. I had to rig a sort of up-@%#$er on the trap line to get enough purchase on the board to free it. The rudder had no damage at all...but I guess that makes sense since the front edge of the dagger didn't either.