How does Perseus punish the wicked King Polydectes and his followers?

Perseus succeeded in his mission to take Medusa's monstrous and powerful head. Upon returning to the kingdom of King Polydectes he thought of punishing them for being so wicked and cruel including his people. He tricked King Polydectes to call his people to gather in order to witness Medusa's head with snaky locks completely forgetting that whoever stares at the head shall turn into cold stone. The crowd gathered including King Polydectes in the balcony of the palace to see Medusa's head and all of a sudden everyone turns to cold statue made of stone the moment they laid eyes on Medusa's head.