[m21sniper]

It's not possible to mistake the overall weapon weight, or trigger feel/mechanism of a taser for a pistol. You'd have to be a brain dead moron to make such a mistake. And even then it may not be possible...
(This would be like grabbing a timing light and somehow thinking you were holding a .44 magnum revolver. Just not possible for someone that's at all familiar with their equipment.)

Also, a cops pistol is in a TRIPLE RETENTION holster. It takes a specific movement/sequence to unholster it.

So the tazer explanation is utterly ridiculous on it's face. And at any rate, there is zero justification for tazing a restrained and non-resisting subject anyway.

None.

At the moment that kid is shot, and until AFTER he is lifted up by his arms from behind then released, his arms remained behind his back. Because he was handcuffed.