OK, whatever the result of the video'd tests are...just don't smoke or carry a lit flame near gas in liquid or gaseous forms. The same holds true for grabbing a hot wire knowing that you're not grounded. ***** happens!
I would have left for the simple fact, while you were working on HIS boat, He was sitting on his 'ever widening butt'... I would have left and called him as I saw it, "Lazy Hick"!