In a war where Purduye got knocked out and woke up to the screams of his brother Decidueye falling of a cliff.
Puduye goes to the temples of the gods to beg to get his brother back.
The change in behavior.
Purduye stood in the middle of the room and fell threw it. But instead of Zeus it was Persephone and Hades!
The First Bull / Tauro
HA HA HA HA HA
Purduye goes into the hell hole and saved his brother Decidueye but came out differently.
Purduye behavior changes and he starts to hate the color red because he was trap in the hell hole for a week and only saw red, while he was looking for his brother. Also, his looks started to get different.
Purduye sees Persephone and charges at he but while he runs for he she says," You will for every remained that form but with four legs." So, he turns him and Decidueye into a bull, and that was how the first bull was made.