My father has grand Mal seizures, these cops did not think that man was intoxicated. Anyone who's seen someone have a grand Mal would immediately know something was up with their brain
The first time my dad ever had one I was awoken at 1am to my mom screeching and my dad spasming on his bed spewing blood from his mouth (bit his tongue) and even I knew immediately it was a fucking seizure (I was 15 at the time and entirely untrained), these cops wanted to hurt someone
A psychosis on heavy drugs can look like you're being possessed by a demon. I'm not saying their actions are in any way justified, but there is some room for them to simply be ignorant towards the common people because of their prejudice. (Which in my opinion should be punished equally as hard.)