I was searching around and came upon a site called CityBarber. They had a guide that discussed when getting ready to shave a person would hold the blade at a 30 degree angle to the face,with the thumb ON the blade never on the tang. The guide said that while the hand and the blade would change position during the shave, the thumb should always be on the blade.
I would never recommend this as a safe or even correct way to hold the blade while shaving but I wondered if anyone else had every heard of somthing like this?