Benedictions: One Hand or Two?

A small battle is starting to rage offline between Levy and Trueman as to how many hands are needed to pronounce the benediction at the end of the service.  Trueman is a one-hand man, Levy a two.   Apparently, Levy is so distressed at being effortlessly outclassed on the spiritual power front that he has signed up for training sessions from the man known to the wider world simply as the Spanish Derek Thomas.  Six weeks of internship with this man and Levy won't be able to use two hands -- for if he did, people would surely die.