Actually we stopped to look at another hartebeest or something probably a kilometre away and I looked back. He was still running flat out towards us along the track.

Either he wanted to get somewhere quickly or he didn't like Aussies and Poms.

Edited to add:

Actually I think I remember. I was just getting out the videocamera to film the running ele when the guide decided to take off again. And took off at speed so no chance of any filming. This was one of those "green" places where you can't drive off roads, etc etc etc so nothing is "disturbed". Except your wallet!

Some of the best running or "charging" ele footage has been from the back of a landcruiser.