Typical police, the guys was going to get down on the ground like they order him then they jump him. No sure if the prongs hit him but keep in mind tazer are design to work through cloths. Even if they did gut stuck in the cloth it should have hit him and the fact you can hear the sound tells you it made contact since it will not discharge without making a completed circuit.
You hit a guy with a tazer and he does not go do would you try jumping on him. They were lucky he already decide to give up and go to the ground, otherwise I think he would have messed those cops up.