Petrichor served in the army for years and killed many 'wings.' Later she was placed in a detention camp. One day, Hazel walked in on her showering and saw she had both male and female body parts.
Petrichor soon walked by a hallway and saw Ms. Noreen was knocked out on the floor with Hazel standing over her with wings and horns. She took pity on Hazel thinking she had been the product of a rape since she was cross-species. She told Hazel to cover up and helped fake that Noreen had fallen and hit her head.