Zebras wrestling

Due to popular request (ok one request), I will be posting some of my brother's safari pictures.  This one certainly caught my eye.  Are these zebras playing?

I asked Charl:

This was an example where one male trying to exert dominance over another. I was quite a distance away from the pair, as this action was on a ridgeline about one-quarter of a mile away.

Imagine being to get this picture of some zebras 1/4 mile away!  I've never seen a picture like this.

PS I'm working on a low glycemic diet.  Trying to find treats.