I just googled the incident and yeah, he was shot by the responding officer after turning to the RO with a mouthful of the poor homeless guy's flesh in his teeth. It doesn't get more horrifically bizarre than that...
But the report I read said his tox screening was clean of everything except for traces of marijuana. No schizophrenic or dissociative disorder medication I know of causes extreme violence in users when mixed with marijuana; I should know, I worked with mental and drug patients for the better part of twelve years.
I would guess that the attacker was likely never given medication, but the report also stated that he had a girlfriend, and no schizophrenic can maintain a relationship without regular medication, so that rules that out.
I guess the guy was, to use a technical term, just plain straight fuckin' nuts. But as bad as this is, the worst part is that apparently a number of commuters drove by and witnessed it going down, as did the security personnel in the buildings whose security camera captured the footage, and no one did a damn thing about it. I can't even begin to comprehend such indifference. It's like Kitty Genovese all over again.
Ultimately it was a pair of bicyclers who rode past and saw it who then notified the police. But Jesus Christ, man. To have a man chewing at your face for eightteen minutes... I can't imagine how traumatic that would be, and wouldn't want to.