A horse swinging it's butt to you can not only be considered disrespectful it can also be considered a threat. If you watch horses in a herd setting when one horse swings its butt at another horse it's warning, basically get out of my space or you could be kicked. Now a horse can do this out of fear or dominance. It's hard to say in these settings when you can't see the behavior or the possible cause.
A horse has to trust in order to except a herd leader. A horse swinging it's butt to a herd leader is disrespectful or fighting for leadership, a lead horse wouldn't tolerate such a behavior. I once watched my little arab do what I can only describe as a fly by kicking to the lead mare. basically she ran up to her swung her butt around kicked her then took off at a dead run. The lead mare penned her ears back waited for her to stop running walked over and wham two solid thunks right in her butt. What did my arab do well followed her around of course with her head in the dirt for over two hours. I have watched several horses swing their butts to lead horse and the result is always the same the lead kicks or chases the other horses around until they remember who is the boss.
Being hard to catch, well I would again treat the horse like you are the herd leader, chase it make it work as paliminolover said make going away from you your choice and coming to you the easiest thing for it to do. After chasing a horse around I always reward it coming to me with a treat to help it remember that it wants to come to me.
Hope this helps
Last edited by lives2hope; 07-15-2012 at 08:05 AM.