Attaboy! Peter picked the right thing to be focused on.

He refuses to let it show how difficult it is for him to carry Peter all the way back to his cabin. Just a few weeks ago he could've done laps around the whole train with the boy in his arms. His body just wasn't healing as quickly as he wanted it to.

Fortunately, his stubbornness is just ingrained enough that it'd be difficult for someone to see the strain- like Peter. The kid didn't need to know. Once they were near his room, Tony groans as he realizes the problem with Peter's room. "Just nod, but you have the top bunk don't you? Manabu, cabin C. I'll put him in my bed."