Ever since the day his power had first manifested, G had spent hours practicing how to use it to complete small mundane tasks in small spaces, turning the power on and off with uncanny precision that would allow for actions to be completed with a combination of super speed and normal speed as required without accidentally going too far because of the speed. It had been what he worked on when there was nowhere on base for him to train, before there was a warehouse. It had been what he worked on in the basement when it was just himself, Sam, Savannah, and Marty living together with two dogs. It had been what he used to tease Sam with during their early illicit encounters in that same basement.
And it was how he was able to now move in front of Vance before anyone could stop him and still punch him without enough force to shatter his jaw, no matter how appealing the thought was. It wasn't the action of a Lead Agent. G would pick that mantle up again in a minute, when he had. It was the action of a man who was tired as hell of people fucking with his family. Hetty had screwed him over his entire life. G wasn't terribly inclined to roll over so Vance could do the same.