Their fortunes changed in a flash. One moment, the UCLA men’s volleyball players were celebrating a trip to the Final Four. The next, they were mourning the end of their season. Bruins volleyball players huddle during their NCAA Tournament quarterfinal against UC Irvine. That’s how quickly the momentum shifted Saturday night after what appeared to be the winning point was wiped out by an official review during the Bruins’ NCAA Tournament quarterfinal against UC Irvine. Given new life, the unseeded Anteaters went on to complete the comeback, knocking off top-seeded UCLA, 25-23, 19-25, 25-23, 19-25, 16-14, at Pauley Pavilion. How big of an upset was this? The Bruins (29-2) had lost just once previously this season, with their only other setback coming against Pepperdine a month ago. “Being honest,” said UCLA senior outside hitter Zach Rama, his eyes reddened with sadness, “I don’t think it’s anything any of us expected just because of how confident we are and our ability to play together.…