Some time after that pillow goes up and over, someone takes a seat near her. A big, quiet someone, who's deliberately sitting with his back to her, his bulk between whoever this is who's huddling and hiding and the rest of the event. It's not the first time he's done this on the train, used his body as a physical bulkhead for someone who looks overstimulated, and it probably wouldn't be the last.

After a few minutes, he offers quietly, "If you need permission to leave, you've got it. No one's going to mind if this is too much right now."