So i was in a group and we decided we wanted to (myself and two of the dps) to go as long as we could without using the hourglass. we brought his health down to about 5 million then I asked for a reset as the group was to far spread out to keep everyone up. he hit the hourglass and the Tank got upset saying we would have had a feat of strength, to my knowledge there isnt one.... and ive been on wowhead searching like crazy but i cant find the answer so i thought i would ask here.. if there a feat of strength for killing Murozond without using the hourglass?