Agent Barton never missed a step.

Bruce Banner marveled at the way Agent Barton was able to keep a handle on his emotions. He had been brainwashed by the (for now) unexplainable properties of the Tesseract and hadn't paused before entering into the fight against Loki. Months later, Agent Barton was as unstoppable as ever. He had entered their current fight against Hammer after coming off a long and grueling mission with the new S.H.I.E.L.D. that ended with Director Fury publicly reprimanding him before sending him to fight with the Avengers. It stressed Bruce out just thinking about it, but Agent Barton had shook it off, gave the team a shit-eating grin (Tony's words, not Bruce's), and said something snarky about deserving fancy coffee later.

Agent Barton was unflappable, and Bruce knew even the Hulk couldn't faze him. When the mission went from simple to Code Green in the five minutes it took Hammer released an inconveniently high number of robots, Banner's appearance as the Hulk became inevitable. Through the hazy memories of the Hulk, Bruce recalled that Agent Barton did not hesitate like Captain Rogers or watch him warily like Agent Romanoff. On the contrary, Arrows offered Hulk a smile as he passed and pointed him in the right direction. Agent Barton never missed a step. Bruce was jealous of his control, the ease in which he boxed his emotions; and if he were honest, it unnerved him to the point where Bruce actively kept his distance.