There wouldn't have been an opportunity for the two of them to have met. Before Director Coulson's team, Fitz hadn't ever been in the field, and he hadn't been on the Bus long, relatively speaking, before... well before Hydra made itself known and S.H.I.E.L.D. had fallen apart from the inside out.

"No, you haven't. We... haven't," Fitz says, and not being able to find the word he's looking for isn't what's distracting him at the moment, it's looking round at what seems to be a train station.

It could be some sort of advanced hologram. Or perhaps a portal to another dimension similar to the ones that brought that alien ship to London, Simmons is hypothesizing beside him, and he nods as he continues to look around.

"A portal..."