It looks like they did tase him, which might have been ineffective, then they shot him.
Sky high on some forms of dope will do this. The question is what does one do with the untazeable that still has its hands up? When is an apparent surrender not a surrender? People are very chary about where this leads, for obvious reasons, and excuses won’t wear forever. At some point someone in sworn position of civil responsibility has to show chivalry, to take some kind of chance.