Thanks for the gif. It looks like a model 36 (or 37) Smith & Wesson revolver.
it also looks like a gun or revolver to me.
next question— if it were a gun, what would be the value of a gun next to the suspect’s body with only the cop’s prints and dna on it, i wonder.
[speculation on]
perhaps the cop was caught mentally off balance when firing the taser at scott did not entirely subdue scott. after that, the cop seemed to me to be entering into a different procedure— specifically, a procedure for when the suspect threatens the cop with potentially deadly force. that was not appropriate, of course. after that sinks in, perhaps the cop uses yet another procedure, a drop gun. that is not appropriate either (and with another cop and a witness nearby, he might not get away with it either), and at this time the cop finally sees the light and picks up the drop gun.
[speculation off]
i am no expert at all but i personally do not see dropping sunglasses or even a taser next to the suspect as necessarily suspicious. retrieving the taser seems like an ok thing to do. one probably does not want tasers to lie around unattended and potentially fall into the wrong hands. also, as has been remarked before, if a taser firing produces chads, then it becomes pretty obvious to subsequent investigators where the initial struggle was, and the cop moving the taser to the now-apparently-subdued suspect would not seem to accomplish very much in terms of justifying the shoot.
if the explanation were as i have speculated, then an underlying problem then might be lack of training, and specifically, lack of training for using tasers. in this regard, as i have speculated in another thread, there may be a parallel between this case and the fruitvale station bart shooting in which a taser was also peripherally involved.