People have a lot of misconceptions about sparring in Muay Thai. They assume that it is incredibly hard core, brutal stuff, all of the time.
The truth is, sparring doesn't have to be like that. In fact, the Thai don't spar hard very often. When you live in a culture where you might fight on a moment's notice, being banged up from sparring is a bad idea. So they play. A lot.
This video is an awesome example of that. The two men in the video are both AMAZING fighters. If you Google their fights, you'll see that both are incredibly tough, dangerous men who have been through some real wars in the ring. Yet here, they are playing, developing timing, distancing, technique...all without killing each other.