Sounded like 12 shots to me, unless a couple were fired at the same time.
The guy appeared to me to be seriously crack or meth delusional. Totally fried. Seen enough crispy critter crackheads to fill a stadium. Meth isn't really the drug of choice here. So have no idea of what that looks like.
Long story short, if a cop says put down the knife, put down the knife.. unless you're planning on taking 6 or 7 of them on with said knife and they're all holding Glock 23's... which could indeed be called suicide by cop.