If he has already figured out he can jump fences do not chase him, that is giving him a reason to jump the fence. I highly suggest using positive reinforcement, rather then P&R for this little guy, for this situation.
Take some hay or small bits of food out and be prepared to be patient. Yes he is going to snatch the food and then back off, let him. But try to beat him to the punch and you back off first, you will draw him into your space. If you use hay it is easier as you can toss it to him out of your space, then take a step back while he eats it. Then he will comes towards you again, toss the hay take a step back, he is being rewarded for coming towards you.
Take some really delicious high value treats with you and hold onto them. When he walks up close to you give him the high value treat then step away from him. Once he is coming up to you then you can put your hand out let him touch your hand then give him the treat, keep moving away from him and getting him to follow you. If he leaves that is fine he is missing out on the goodies. He will be back.
After he is following you all about then do the same thing with the halter that you did with your hand, have him touch the halter then give him a treat, step back. Repeat the process until he is no longer moving away from you, then put the halter on and make sure to reward him for that as well.
Since he is already broke it will not take long at all for him to come around and be all up around you again. Especially if you change the game of chase into giving him a reward for doing the right thing.
If your interested in learning more about positive reinforcement there is some good information on the internet, and videos. If your worried about using food and muggy behavior don't as that is one of the first behaviors you teach the horse, to not do those things. I used to be all P&R, but since working with a positive reinforcement trainer I have learned to value that method as well and find it handy in situations such as yours.
My trainer friend, who has impeccable timing btw, was able to get a halter on and off a mustang fresh out of the pens within hours of walking into the pen with him. Or I should say got the horse to shove his face into the halter, on his own, she thinks they need to halter themselves LOL. Then the owner was able to do the same thing. Using only positive reinforcement.