Honestly, as much as he's willing to admit to having been misguided, hearing it Optimus say it grates on him a little. Probably because it's such a grotesque understatement – it feels condescending, especially coming from someone who's spent so long opposing him. He doesn't remark on it, though, just shoots him a frowning sideways look – one which turns to the sky as Optimus does, the frown still in place.

"I assume we happened to it," he says, "one way or another."