He was running, he was very far from the two of them, and this is a world where cops don't tell people to stop running before they shoot them.
I've run from cops many times, drunk even, been caught exactly twice (once when an apartment complex we tried to cut through had higher walls on the back side and one of our friends was very slow slipping out of sight so we got chased, once when a slower friend was above me on a staircase and I couldn't get past them) and it was definitely a thrill as long as it was a situation where they're left wondering "what the fuck kinda crackhead kid just runs up a fence with barbed wire on top and keeps going" instead of actually presenting a target.
This was a long time ago, cops got super militarized after the 90's so it's a different situation entirely, you run from the cops nowadays, you do it before they get there, and have cover, or you're getting shot.
The video is right here:
https://twitter.com/MattWSB/status/1271909804848623617 he was running long enough to go past two and a half cars before he even turned back towards them, he obviously wasn't agile or coordinated or sober or collected enough to spin around and collect the firearm from the closer of the two cops chasing him. To me he demonstrated this when he didn't take it while he was right there and tasing them, because again, it's a dumb situation all around, one I'd never take the steps necessary to end up at in the first place, but if I was dropped in that position and realized I'm a black dude with two officers wrestling with me who are probably going to kill me, grabbing a taser and running straight away through an open and somewhat lit parking lot is NOT how to get out of there alive. Even just tasing the closer one to push him on the other before taking off through cover next door to the parking lot is better than what he did.
Hell, he could have tried ducking behind that car and tossing the taser out while shouting "PLEASE GOD DON'T FUCKING EXECUTE ME IN A WENDY'S PARKING LOT FOR BEING DRACK WHILE BLUNKING" and to be fair they may have still just shot him because cops do that.
Letting him get away even if he did fire it at them that is better than what they did, they had every reason to believe he would keep running because he was currently doing so, and usually when someone stops chasing you... you don't just stop running so you can go kill them.
They knew who he was, his car is still there, if giving him a DUI and charging him is so fucking important, show up at his house tomorrow?
I mean, obviously it wasn't
that important, can't charge or fine or imprison a corpse, and just putting myself in the position of an officer who lost a taser to a drunk who was running from me with said taser... I can't imagine being so fucking terrified of this drunk fool running away with my taser that rather than telling my partner to toss me his, or just duck behind the nearby car when he pointed it at me... any number of things which I could do before I'd make the massive fucking escalation of drawing and executing someone who I could just let run and either wait for him to come get his car or meet him at home, but I'm not a coward.