Basically I think Serino was pissed to be the lead investigator in an interracial homicide because he knew the effects of the Ware case on the department and his fellow officers and he felt this was going to go the same way. I think his motivation for wanting to arrest George was based partially in that. It made it easier for him to not believe George. He was biased from the get go. And so he leaked stuff to help the false narrative to get an arrest.