Proper Use of a Taser

I know that every so often I've complained that tasers are sometimes misused. However, there are any number of times when the officer uses the taser for that which it was intended (an intermediate step short of pistol use). When an officer uses it properly he should get credit.

Here's an officer, faced with a big guy with a knife, who absolutely uses the taser in the way it is supposed to be used (video on right side).