"How?" Tony wanted to know, although he had a feeling he was asking a bit much with that question. That was not only hard science stuff, it was space science which was basically bullshit some days. As much as it amazed and astounded Tony, he was also wary of it. His experience with space hadn't been kind and he was wary for it.
He approved though, of the X-Men methods of teaching alternatives to killing -- there would always be accidents or times when there was no other choice, but making a deliberate effort to avoid extreme violence was important. At least, Tony thought so. Deaths that he could well have prevented weighed heavily on him.
Sentinels sounded like a shit show, but not ones that were especially hard to fight, but he shook his head at the offer of something more familiar. "I'm interested in that later -- seeing how alternate versions of the Avengers fight, including myself, but infighting isn't so uncommon I can honestly say I'm not in the mood." Not that rampaging super robots wasn't also a bit of a sore spot some days. On the plus side, he hadn't designed these.