This kick from a heroic Vortex Pinnacle today made me rage like a madman. We were killing the dragons before the second (?) boss, the ones who heal themselves and split damage between targets. Seeing as they hit for upwards 50k on a lone tank I said "please stack on the tank to ease on my mana" as I was the healer. Me and a shadow priest stood on the tank and we all killed the dragon without any problems whatsoever. The priest then said "why stack? they cleave." I responded "they don't cleave, they split damage between targets." "they do cleave" "no" and I was kicked. Great success in trying to learn players new mechanics.