What is balked here?

[bob jenkins]

Looks to me like he spins on the front foot and then steps.

That said, and as I've said before, the balk rule in MLB and the balk rule in amateur baseball are the same, but the way it's called is different. Most MLB balks are for things that we wouldn't see and don't affect play (as in the video) and most MLB pitchers wouldn't do the stuff that our pitchers do. Conversely, if we called every litle twitch, every base runner would be balked home in about 6 pitches.