urine-day: the head monitored for swelling
Hal’s head, closely monitored by deLint and Staff, is judged still level and focused and unswollen/-bludgeoned by the sudden éclat and rise in general expectations.
Context
The institution watches the mind the way it watches the body: Hal's head is "closely monitored by deLint and Staff" and "judged still level and focused and unswollen" under the new éclat. The same staff that ranks the body surveils the psyche riding on it, checking for the swelling or bludgeoning that success is known to cause — the academy managing not just the athlete's game but his relation to his own rising number, because the number is exactly what tends to ruin the head that earns it.