Serena smirked and said “thank you for that” when the mage was destroyed a huge wall of sand appeared and Serena said “you triggered my trap card. Sand wall. So now since its master is gone the sands of the desert will go wild and attack your side of the field once your turn is done. But it will either attack a monster, card, or your life points directly” 

Yugi said “I feel…something is behind us…calling to me…”