Now that Ares had disappeared, the spear he left behind could be used by him.
Jerry had to think about the worst case scenario.
He just didn't know when Ares had given him the right to use the spear.
Now that he had a weapon of the same quality as the Sword of Victory, However, Jerry was not happy at all.
As he had the prerequisite of becoming a master-servant relationship with the Sword of Victory, Jerry knew that as long as he was alive, the Sword of Victory would never acknowledge anyone else as its master.
Unless he met with an accident and died one day, then only the Sword of Victory would be able to find its next master.
And now, the spear had acknowledged him as its master. In other words, its previous master, Ares, had probably met with an accident and died.