It is super important to hold off dps between phase shifts. Aggro must be controlled by the tank or else it's poopy.

This fight is a lot about quick movement of your character through the platform. You don't get to hold still much. 

During the bear phase, bunch up on the bear's ass and stay to it's rear, don't get in front. If you do you will get cleave damage and it will take you out quick.

The phase with the tornados is rough, but the raid must make sure to spread out. If you move to another player while  a tornado is coming at you, all you do is get that player messed up by the tornado. 

In the final phase, you can't hold still at all. Move around often or a flame pillar will getcha.