Schtitt and Mario hang out (p. 79)
it’s usually eighteen-year-old Mario Incandenza who gets to ride along in the sidecar, carefully braced and strapped, the wind blowing his thin hair straight back off his oversized head, beaming and waving his claw at people he knows. It’s possibly odd that the leptosomatic Mario I., so damaged he can’t even grip a stick, much less flail at a moving ball with one, is the one kid at E.T.A. whose company Schtitt seeks out, is in fact pretty much the one person with whom Schtitt speaks candidly, lets his pedagogical hair down.
Context
The sidecar: damage inventoried plainly ("can't even grip a stick") inside an image of pure joy, and the "possibly odd" fact that the most damaged kid on the grounds is the one the philosopher-coach actually talks to.