Betting odds fluctuate during live events due to a variety of factors, including real-time performance changes, injuries, and other developments that impact a team's chances of winning. As the game progresses, sportsbooks adjust odds to reflect the current state of play and to balance their books, responding to the volume of bets placed by the public and professional gamblers. These dynamic adjustments aim to encourage betting on both sides, mitigating risk for the bookmaker while providing opportunities for sharp bettors to identify value before the odds shift further.