Loki is reminded that the Chitauri sceptre no longer belongs to him, and that it should be returned immediately. He is also obligated to return agent Barton to his former, uncompromised state once more. We can only rely on agent Romanoffs violence for so long. Loki is reminded that agent Barton answers to me, and only me, no matter how much you Miss your little Hawk.
S.H.I.E.L.D. Recruit Survival Tip <-- I'm just imagining ship wars in the staff room, like "I SHIP IRON MAN AND CAPTAIN AMERICA AND YOU CAN SHUT THE HELL UP." "NO, IRON MAN BELONGS WITH LOKI, YOU IDIOT!" and then the Avengers are just standing in the doorway, laughing.