"Was he fighting Thanos, too?" There's a little jolt of excitement in Peter's voice at that. He knows that he and Quill and himself and the others were already about to start fighting him, but maybe Thor showed up, too -- in the middle of that final combat! Obviously, Thor couldn't have been fighting him before then. Thor and the Hulk were the two strongest Avengers; Thanos would have been easily trounced by either one of them, he's sure!

"Did he say something about that?"