Listen, NO ONE just shakes off a taser. If both probes struck him (and stayed in) he would have had the most electrifying 5 seconds of his life. Now, it is possible to pull out the probes after the 5 seconds or resist if one of the probes didn't connect correctly. Also, the cops could have been "drive stunning" him. Which means they just pressed the taser against him and gave him 1 or 2 second bursts. But if you have been tased, or know anything about tasers and how they work, you would know that a correct tase with probe deployment locks up every muscle in your body. You're not shaking that shit off for the 5 seconds you're lit up.