Johnny was helping more than he realized, or, at least, more than Sue or Tony were actually helping. The best the scientists in the room had managed so far was panic and theories. Hopefully, his practical approach extended to an understanding of what could take his sister's mind off of the whole thing, because leaving her alone sounded more like leaving her to dwell on it.
"Okay, out, right now," Tony commanded, clapping his hands once then moving to shoo Sue along to accomplish her important task of nothing at all. It was aborted, though, and he held out a hand to stop her before she got very far to pluck that thing off of her head with a boyish smile he did try to contain, then resumed shooing. "You, too," he turned on Johnny, with a pointed cock of his head towards where Sue had been standing. Johnny had been with them so far, he was committed to this. That meant doing what might help his sister, not the video games