Easy exploit. Might be common sense, but meh.
So all you have to do is use Beastial Wrath, then mount up (not sure if it works with dismiss pet, but it might). Run somewhere, take a leak, or get a snack for 2 minutes... then come back, dismount, and your pet will still have Beastial Wrath. When his current one expires, recast it. Ta-da! 2 BW's.
Not sure about possibilities of what you could do with this... all that come to my mind atm are maybe killing an elite if you dont have enough room to kite where you're standing.
Searched for this, nothing come up.
Voze out.