Harry dived; Cho saw what he was doing and tore after him — Harry was speeding up, excitement flooding him; dives were his speciality, he was ten feet away — Then a Bludger, hit by one of the Ravenclaw Beaters, came pelting out of nowhere; Harry veered off course, avoiding it by an inch, and in those few, crucial seconds, the Snitch had vanished.
There are no more uses of "crucial" in the book.
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Doing well on the SAT is crucial to getting into the college I want to attend.
The information is crucial to making a good decision.