So Shiro felt compelled to think:

Why is he doing this? And where is he going? Shiro had seen a glimpse of something purple Keith was holding when he thought no one was around, that he quickly stashed when he realized Shiro was there. What was that? Was he communing with the galra? Did he have a falling out with one of the team members? Did one lead to the other?

And how would I get him to trust us again? When I talk to him sometimes, he seems a little guilty, like he's failed the team in some way. So I feel uniquely qualified to try and help him, at least more so than the other crew members. And I have to. ... We have to. If the Galra continue to scour the universe unopposed...

we could lose everything.

Shiro bolted up and started for the door.