If they were playing by the rules, a man also didn't pull a gun on his friend, and a man definitely didn't threaten to taze him under any sober circumstances. Still holding the pistol by the barrel where he had taken it from Coulson, Jasper barely waited for the Agent to right himself with the weapon from his ankle before jabbing the butt of his own gun into his nose. He had crossed the line and Jasper was no longer going to tolerate the interruption.
Freezing then, letting the tension mount until someone was good and ready to lash out and no one seemed about to diffuse it instead, Jasper took his upper hand while Coulson was still reeling from the first hit to crack him against temple with the heavy pistol. The whole production barely took a second, and Jasper was left standing strictly with the gun removed from the situation and holstered under his jacket. "Mr. Hammer," he addressed one more time, determined to do this without further incident, "a seat, please."