I was beginning to summon people for heroic Bot this morning, and i accidentally clicked the wrong group member, so I quickly moved back, and I noticed the cool looking Warlock-ish summon effect thing that swirls around your feet was still there. I could mount up and such, but when I went into bear form it went away, I then did it again and I realized that when you /duel someone it goes away, and when you fly it goes away (I was able to get on my drake with it, but the minute i went into the air it want away)
Anyways, gl with it!