If you look right before he falls (13 seconds in) you can see his leg start to turn, then he falls like he gets tased. Now I can't say 100% positively he was starting to run but it certainly looks like it plus I've watched enough episodes of Cops to have a pretty good idea based on the person's body language when he was approaching the hood he was planning on running.
After watching it a few more times, the guy was absolutely starting to run. the way he turned around sort of hunched over keeping his eye on the officer then watch that stepping motion with his left leg(closest to the curb) he sticks it out and plants it and then twists his right knee he was getting ready to take off. I bet you if you guys go watch a bunch of clips from Cops where perps run from being frisked you'll see most of the same body language.
OP: Purposefully mislabeling clips is only adding to the fire. Oh and the hosts of the clip are idiots. "He won't go to jail" Really you think? A cop not going to jail for using his government issued non lethal detainment device the injustice the inhumanity, get outta here. You don't want them having guns, you don't want them having tasers, you don't want them having billy clubs what the **** do you want them to do walk up and say hey you're committing a crime come along with me here so we can get you charged and tried? Are you all delusional? Here's a valid idea, if you dislike the police that are there now, become a cop and protect your fellow people the way you would want to.