Unfortunately since Tony had been slow leaving the train, he'd missed the scene to a degree. He'd still walked out and spied Luke speaking to none other than Darth-Freaking-Vader, though. If his very next actions hadn't been to also spy Steve Rogers in the crowd, he might have gone over to stand by the kid as support.

As he saw the young man's face now, he knew he'd been wrong to not have done that. He wasn't making that mistake twice. His mug and papers are abruptly handed off/ shoved at to Ignis (sorry) so he can reach out and catch Luke. "Hey," he said, drawing the kid's focus and his body closer to him. It wasn't quite an embrace, but it was protective and easily moved into a hug. "You okay? What's wrong?"