I noticed the same thing. My initial thought was that the officer must be really bold. He didn't seem to care that the other officer was right there. But your theory seems more plausible.
He still might've planted it, and maybe he was just bold about it. Whatever the case, we'll find out more soon enough.
Here is a more plausible scenario regarding the taser:
It was never fired. It was dislodged from his belt in the process of a scuffle (see post 133) and the cop *instinctively* went back to secure potentially dangerous equipment that was simply lying on the ground. My military training would prompt that kind of instinct, for example. Weapons should never be more than an arm’s length away.
Do we know for a fact that the taser was discharged? Or are we just going with unreliable first reports like in Ferguson?
Again - standard disclaimer - I’m not saying what the cop did was right, I’m just saying that it’s hard to predict rational actions in the heat of an irrational moment.