cutting the heel

So here I am cutting the heel with a small knife. Its a very sharp small Frost knife which I use all the ways I am

not supposed to do. Cutting against myself and holding the blade with my fingers. But fortunately, I never cut myself when working. I cut myself in the kitchen, in the garden and so on. And I also put my thumbs into dor openings and slam the door. Just look at my left hand thumb :-(