Aaron took what Jack handed to him and he did not say a word. He could tell she got a small bit of satisfaction from it, not because she thought she was better than him, but because she was a known prankster. He did not think much of it and continued walking down the hall, not saying a word to either Silvyr or Jack.
He knew he was going to be the one using the Imperius curse. Jack was in the Order and Silvyr was leading the Order to believe he was a member so by process of elimination, Aaron was to be the one to use it because he was the only Death Eater. It amused Aaron a bit to realize that the Death Eaters really had no one on their side. Aaron was, technically, part of them but he did not care for them at all. It was all for show.
Once they reached the door, Aaron looked at Silvyr and whispered "Stay out here and keep watch, me and Jack will be right back out." They had gone over the plan multiple times, but Aaron was a perfectionist and had to make sure. He could not risk being captured, not now. He had risked way to much to come this far and have it all ruined because of some stupid Order and Death Eater plot.
Jack opened the door and Aaron followed her very closely. Mikaela did not have a chance to react because as soon as the door shut behind them, Aaron pushed past Jack with his wand already in hand. Very casually he said "Imperio." and she did not have a chance to react. Aaron watched as her pupils became smaller and he could tell she was under his control.
Just for safe measure he moved his wand in a familiar motion and made her stand up and then twirl around. "She is under my control. Lets move on."