If any horse turns their butt to me, they get a smack on their behind. Don't have to be by their shoulder, behind them, the location doesn't matter SO LONG AS you aren't going to get run over or kicked. As soon as they turn and face you, soften your aura and back up to give them a release. :) That's how I would handle the stall. I wouldn't bribe with treats or whatnot, treats are meant to be earned, not handed out. Then you get other problems like treat mongers, pushy detectives, and nippy habits. So make sure you always give the horse release once they do what you ask.
As for catching, if they walk away, I make them work hard away. I will make them trot, canter, gallop away from me. Only when they stop and look at me do I stop, back off, don't give them direct eye contact and draw them into me. If they don't come, then I try approaching, if they turn and look away, I drive them off again. It works for me, especially lately since my boy has made it into the "cool crew" and cool apparently means no moms allowed.
Well he sang a different tune soon as I made him work around his friends.. :P
"Strength is the ability to use a muscle without tension"