I only watched a little bit, but when I saw him tig welding with bare hands, my first thought was "dumb-ass". I was wearing a thin shirt when i had my first lesson tig welding aluminum, and a day later I noticed an irritation on my torso. I looked and saw I had a nasty sun-burn, with a distinct line where I was protected by the bench. I never thought about the rays going right through the shirt..