Always a possibility. Could also be from smoking "modified" Swisher Sweets.
Personally, I don't think his behavior requires anything other than hubris as an explanation.
... And I see more than enough hubris running through him just in the behaviors no one denies, from the robbery to the refusal to get on the sidewalk.
To me, the part that's hardest to explain with that theory is the allegation of running toward gunfire/charging an armed officer. To me, there would have to be some kind of psychosis going on for that to happen. Whether drug-induced or mental illness. It's just not normal to do that, at all. It's reasonably normal, IMO for people, especially teenage boys with something to prove, living in areas with a lot of police distrust to ignore police commands. That they allegedly ignored OW's order does not especially shock me. And I believe robberies are pretty common there too - not saying that makes it right.