"It can't be mine." Though from the way he says it, it's clear he's not sure. The look he gives Olivia isn't helpless, exactly, but it's... lost. "Tony wouldn't..."

But given the right circumstances, Steve can see a world in which Tony would. He can see a world where something like this happened, where there were enough people with abilities functioning outside of government control that it became in some way an issue. He can certainly see a world where Skull would try to assassinate him, given the chance.

"If it is, Olivia, I have to go back, more than ever. If I can keep this from happening, see it coming and stop it, I have to be there to try."