He's not the best at cheering people up. He also doesn't know Lina directly- only through Sayaka and a few odd incidents. But there's a sad sense of protective drive just seeing her collapse like that.

Rox is careful as he approaches, trying to keep in her line of sight so he doesn't surprise her, crouching down to her level when he's within a couple feet of Lina.

"Come on, get up. We can make a bonfire. Okay?"