This is how Petra deals with bullies, by beating the living sh.t out of them (and even klling them ouo/) )
In a mages' community, the only normal blood colors of mages are the ROYGBIV color scheme. Anyone who falls out of that is like having a deformity on your body. They are also known as witches.
Petra was an angry and mu.rderous snot back in her day gee whiz