It's impossible not to hear the small quarrel the pair is making, even if Shadow can't exactly listen what it is all about. But he does turn back at them, if only merely glancing over his shoulder with a mostly curious stare than a judgmental one. He's completely distracted from the briefing by how close those two seem to be.

Aren't they lucky?

Not that Shadow cared being alone... It was alright, it was how things were supposed to be. If he was there it was because of an accident, otherwise he'd probably be dead. Shadow wouldn't want any of the people he met before to be stuck with him in there, in the middle of a war. Sonic and the others were where they belonged, or so he hoped. He? He had always been the one that didn't quite belong in that picture, his part in that tale was over. And it was alright. Even if he cannot stop staring at them.