what does oberon decide to do when he realizes that puck has made a mistake?

Oberon is furious about the mess that Robin has created and orders him to separate Demetrius and Lysander. He then tells the puck to make the men fall asleep, and to rub the juice on Lysander's eyes and make him see Hermia when he awakes. Robin mimics the mens' voices, causing them to follow shadows and sounds and effectively separating them.