What I referred to as heeling is when new shooters poke, for lack of a better term, the gun out just as they pull the trigger which causes the heel of the hand to go down and the muzzle to go up which results in shooting high. I have heard it called trying to help the bullet out of the barrel. We only went to Semi autos in 2005 from 686 S&Ws to glocks so I was referring to revolvers. We always started our people out shooting with one hand because it is easier to see mistakes in grip and form, then transitioned to the two handed grip. I had resigned as a firearms instructor before we went to semis because I didn't have the time anymore with the new position I was in.