The B - back is in a three - point stance with his down hand two yards behind the QB 's feet .
The base formation of the Pistol - Flex has the QB in a shotgun set four yards behind the center .
The B - back is in a three - point stance with QB 's down hand two yards behind QB QB 's feet .
The base formation of the Pistol - Flex has the QB in a shotgun set four yards behind the center .