Well this is what happened.......
I was doing 2v2s on my mage, we were playing in the Orgrimmar arena aka Ring of Valor (It's the one where you start off in a lift and go up). We were playing against this team that kept LoSing me around the pillar, but I managed to pull off a quick sheep and noticed that the guy I sheeped glitched into the pillar. In the end it was a 2v1 fight and the guy was unable to get out.
Whenever we got this map I kept sheeping them whenever they stuck to the pillar and tried to LoS me, I would say it works 50% of the time since the sheep goes in random directions. Also I was doing 2v2s on my Paladin and a Mage did the same thing to me and I got sheeped into a pillar and then fell through the zone and got stuck in a little box and was unable to get out.
This might work with fear,blind,hex, etc.