There's something wrong here, even somebody as dense as he usually thinks he is can sense it. There's a little do you hate me? in the way his head tilts, watching Jim. That was some climb up the stairs if he's that grumpy.

Climbing. Jim couldn't walk, not that easily, not with him on his back-- and Kyle's gaze drops to the leg. His expression changes from worried to horrified.

'Your leg,' he says hoarsely. 'Are you--'

Did someone hold you down? What happened?