What does oberon command puck to do Midsummer night dream?

He wants Puck to use it to charm Demetrius into loving Helena. However, since all he says to Puck is that he will know him "by the Athenian garments he has on" and since Lysander is wearing Athenian garments (whatever you want to take that to mean) and appears to need some help loving Hermia since they are sleeping apart from each other, Puck uses the flower on Lysander instead.