Hehe... I didn't do this but its pretty cool just the same :p
(http://guilddahui.homestead.com/files/2shot.jpg)
If you can't tell what happened... this guy got a finishing blow on one mob while the other was /shielding it, so the shielding mob got hit for like 16k or something and the other one took a few thousand and they both died in the same swing :p