Shaun, I remember once when surfing, I had an ankle strap on & when I fell off from a big wave & my board shot up in the air & my strap pulled it back down & the fin hit the heel of my foot slicing it deep & I was bleeding pretty bad. I got the hell out of the water before any sharks caught scent of my blood. That day was done but it was a lot of fun back then. I do remember I had to get the nose down as far as I could w/o it going under which gave me the speed & best ride ever.