When a dealer has a blackjack, players face a challenging situation as they know the dealer has a strong hand that is likely to win. Players typically respond by acknowledging that their chances of winning that particular round are significantly diminished. Most players will lose their bets unless they also have a blackjack, which results in a push. In this scenario, players need to assess their overall strategy for the session, considering whether to continue playing aggressively or to scale back their bets.