Following ails suggestion closely wont work. If there are multiple raid groups attacking the boss and one group dies 20 times the boss rages for everyone? So easy to grief the boss. And impossible to kill it if a competing clan or group constantly dying around u. And if the boss only rages for a specfic group, they can just reform a new group and start again. Basically any group-based death count can be exploited very easily.Unless they follow his suggestion closely and make raid style groups where only the players in its deaths actually count...
Any other issues? No? Okay.
Which is why it has to be a player-specific death count.