Sometime after the giant war
It was a sunny day in Camp half-blood. The stills had called everyone to the arena, for some reason. Honestly, everyone was wondering what the two devilish sons of Hermes were planning. However, everyone was excited regardless.
On the other side of the arena, the two boys were pushing Octavian towards the big event. Hey had interested him in coming with them by saying that there were weird markings in the arena. Before they had him enter, they told him that for some reason, only people wearing red can see the markings. They en handed him a red shirt, which he put on as they pushed him into the arena.
He stumbled to regain his balance as he looked around for the markings. After a minute of looking around cluelessly, he was about to call the Stolls on their bluff.
However he couldn't due to hearing a loud noise. He turned around and found a huge metallic bull, which was getting ready to launch at him.
Blood drained from his face as he started running for his dear life. It took less than ten minutes for the bull to catch up with him.
Then it accidentally ran him over. And the Stolls were never allowed to get anymore pets.