The correct answer is "super lucky".
We were out a few days ago on our usual lake (Utah lake) which is a natural, shallow lake. On this particular day we were way out on the west side with like fourteen people in the boat, about two hundred yards from the shore, and I noticed the depth gauge go to like two feet suddenly! Just as I was reaching for the key and the throttle, we heard the boat hitting rocks; not too loudly but unmistakable. I got out, and the switchblade was lightly touching the rocks. We floated the boat out deeper and I checked the prop with my hands (you can't see two inches in that lake), and it felt fine. We finished the day with no problems.
Back home I took a second look with it on the trailer. No propeller damage, some slight scratches on the bottom of the rudder, and the leading edge of the switchblade has several little dents where it hit the rocks. We've been out since, and everything still works fine.
I can't believe how fortunate we were.
Has this happened to anybody else; particularly with a switchblade?