Blocking for a quarterback that likes to hold onto the football and extend plays with his legs, looking to make plays down the field out of structure can often be rather difficult for offensive lineman overall. Typically, a linemen needs to block for roughly 2-4 seconds — on average — from snap to throw for a quarterback in the passing game.
With a mobile quarterback that looks to extend and get out of the pocket, that can go all out the window, and can often make the offensive line’s pass protection numbers look worse than they really are.