While running a friend through SM Cath today on my DK, I pulled the last boss, Mograine, all the mobs to the left and right pulled. Since my DK was only lvl 60, I had my lock friend soulstone me and run, but not before I killed Mograine and Whitemane spawned.
It ended up with me dieing, soulstone rezzing, and him running back to entrance with half the istance following him. I used some healing abilities and eventually killed Whitemane at the entrance. She rezzed Mograine, but he didn't come running. He had actually reset.
So what does this allow? An easy way to farm the Loot that Whitemane drops
Just run back to the entrance, kill Whitemane, then repeat.
Not very big, but quite fun when farming for a clothy!