Not that he thought it would help, but Tony advised, "Relax, have a drink," to at least stop her from wearing a groove in the floor. In his defense, whatever she thought she was doing wasn't helping anyone, either. There was more to this story than his poor hostess was telling if she was this anxious already, so Tony must have missed quite an adventure in risk-taking. Someone had to have turned it on, science didn't work like her magic and depended on silly Laws, and he didn't see anyone else here.
Somehow, though, he was the one under fire, and he was pretty sure he never misplaced a wormhole engine. Tony pursed his lips, waiting for Wanda to chill out and stop looking at him like that because he was asked here to help, and he usually didn't do that for free. Not that Wanda would know much about that. "Am I interrupting something?" he asked, not caring about his part in the story she should have been telling him, but hoping it would buy him some time to figure this thing out. There were only so many people on Earth that could put together a time machine, and as alien as this loft was to him, Tony was sure the machine wasn't space-alien. Its unique ugliness suggested S.H.I.E.L.D. design philosophy, but they never kept anyone on the payroll that was actually any good at anything. Did Wanda hook up with a crazy ex-agent Tinkerer type? That would have been an improvement on her usual type, but complicated the shut down process; that kind of guy liked to put bombs where the off switch went.