Imperius Princeps! Um... I mean....
The call from Atlantis came in from Atlantis while Mac was working out at Avengers mansion. And so here he was, standing in front of the screen at a sort of parade-rest, hearing his sovereign cousin's information and instructions, and answering questions in turn,

"Understood, Majesty. I completely agree. This should be in and out, not take a lot of people. I can handle it. And honestly, Sir, I don't mean to sound chauvinistic, but Nim and Korra don't need to ... hear that kind of language, literally and not. I'll contact you when it's done, Majesty."

And with a traditional Atlantean salute, and the call closed, Mac just grabbed his helmet and got ready to head out.