COTW: Man Knocks Out Woman: Self-defense?

This week's Case of the Week involves a video that has been making the rounds of the internet the last day or two showing a large white man apparently knocking out a smaller young black woman with a single punch.  I've seen reports that the man has been arrested, and presume that he will attempt to justify his punch as a lawful use of defensive force.

If you haven’t seen this video yet, I’ve embedded it here:

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