[He shakes his head, frustrated, but not because of Jeb - never because of Jeb. It's because he hates when Jeb assumes he's a burden to everyone around him.]

You're not being selfish. [He swings his bag over his shoulder.] He's your brother...you just want to help him. [Even if he doesn't care for Silver, he knows how important the bonds between siblings are. The next words are reluctant as he tries to give his feelings shape, but they're sincere.]

And you're my best friend...so I want to help you.