There is a strange woman sitting at one of the tables at the soup kitchen, writing at a desk. Both the non-volunteer adult and the expensive electronic device are very out of place.
Awww.
She continues not to impose social interaction on him where unnecessary over the next few days.
Aaaaand then he has to go off to Battle School. Well. Hopefully that works out better than her worst nightmares.
That's not really surprising.
Eventually it is time to take a flight to somewhere more accommodating of spaceship launches than London.
This is not normally a concern she has but wow she hopes Battle School doesn't fail to be sufficiently intellectually stimulating for him.
They reach the spaceship. She says goodbye.
"Goodbye," says Martin. "Thank you for rescuing me from probable death by starvation."
He would also like to avoid attracting attention. He takes his cushions and sits somewhere underpopulated.
The quiet girl picked a spot in the best avoiding-notice area; right next to her is probably the best place to avoid being noticed by anyone else.
He hesitates to do that because she is so obviously trying that it seems like she can't possibly succeed; but somehow she does appear to be succeeding, at least moderately.
Things that are obvious to him are not necessarily obvious to anyone else. Also the other girl is sort of attracting a lot of attention.
Anytime it looks like someone's paying attention to the other girl in particular she makes a point of talking to them, is that a clue?
...yes. That does explain it.
It still leaves the question of why, but... sometimes people just do helpful things because they can afford to.
Most people haven't, since he left Rotterdam. And starvation isn't a concern in Battle School. But it does imply she might be in the habit of thinking she can afford to do things not directly concerned with her own survival.
The other girl looks much less malnourished than a starving street urchin but not none. That combined with the wary way she assesses everything around her, not with skill but with a lurking paranoia, suggests that she might have more experience with survival as an immediate priority than most of the kids on the shuttle.
She would be so glad he thought so, if she knew, and weren't avoiding attention like poison ivy.