Wakeboard Revival

I was driving. Tyler (Treelo) was wakeboarding. Claire was with me in the boat. Suddenly, Claire yells, “Down!” I interpreted this to mean that Tyler had fallen and that I needed to turn around and retrieve him. I slow down dramatically and turn the boat around when Claire yells, “Up!” I’m amazed. How did Tyler go down then pull himself back up? I’m impressed. Five seconds later, “Down!” Now I’m really confused. I realize Claire and I aren’t thinking the same thing. I finally figure out “down” and “up” referred to the speed at which the boat was travelling, NOT Tyler’s position. For future reference, “faster” and “slower” do just as well. I wish I was watching rather than driving. It had to be funny to see Tyler’s face when I slowed down to 5 mph and started to turn the boat around.