I believe being shot by a taser is part of their training in its use.
Seems they could have done a little more to resolve this without force- maybe a pantomine of putting the knife down.
You are correct, getting tased is a part of training. Our son recently got tased and said he will never tase anyone unless absolutely necessary-its incredibly painful. Im glad its a part of training so they know exactly what they are inflicting.
The family watched the video of him several times and laughed at it. Not me-Im his mom and it hurt to see in pain like that. He had such a lingering pain and that the officers submitted his reaction to the manufacturer.