That is this person's answer, then. Ken's shoulders slump. Wormmon looks up at him, worried. Gar had made Ken-chan feel bad! Oh, no!

But then Ken moves, without saying a word. He keeps his back to the window on the opposite aisle and leans against the wall, choosing not to take a seat. Instead, he keeps vigil, and ignores the voices he can hear outside.

There are others he could be helping. But if he leaves and something happens because he couldn't talk Gar out of this -

That would haunt him more. So he'll stay.

So that, if Gar's making a mistake, he won't be alone when he realizes that.