In this photo, you can see the depth of water by looking at Pop's knees. Although this instant looks as if Pop and I are going well, two things are about to give me a heart-stopping moment: My lower leg has slipped slightly behind the vertical and the closing of my knee angle has collapsed my seat down onto the saddle. Unfortunately for me, I have crossed the line from sitting behind the motion to sitting down. Because my seat bones are down on the saddle rather than suspended just above it, Pop is about to give me a terrific kick in the seat of the pants. | © <PERSON>