When Perseus arrived, he hovered over the gorgons, he didn't know which are medusa was. There was a chance he would hit an immortal Gorgon instead of Medusa and if he woke up another gorgon, he would die. Hermes helped Perseus figure out which one as Medusa and he built up the courage to kill her.
The Road Back
Perseus found a sea monster who was about to devour a princess. once he rescued her, he took her home to marry her When he got home he showed Polydectes Medusa's head, and turned him to stone.
Once Polydectes was killed, Perseus could reconnect with his family. He planned on traveling and visiting islands,now that he knew the island he was on was under safe rule. He also felt better that Polydectes was dead since he sent him on the dangerous task in the first place.
Return with the Elixir
Once kind Dictys became the ruler Perseus decided to travel to other Islands. Perseus went to Argos because his mother wanted to see her father. He traveled with his wife Andromeda, and his mother in the games.
Perseus travels with his father to take part in the games. When Perseus is throwing the games, a wind blew it into the stands. He hit, and killed king Acrisius which was his grandfather
After the games, it was realized that what happened was already planned. I was a part of fate, and Perseus was praised because of the accident, Perseus fulfilled the Prophecy of the oracle at Delphi