As a mage here, it is beneficial for the raid to buff everyone with Amplify Magic. All the damage dealt by Saurfang and Blood Beasts is purely physical, therefore Amplify Magic will only increase the healing taken by raid members. If anything, try to at least have the tanks buffed with this. [thanks to Sky for that tips]
Place yourself fine before the start (8m from your mates) and as far as you can from the boss (he will not move a lot and this is convenient for the beasts).
When beasts appears switch with Pyro. And remember if a Beast come close to you you will be slowed but you can frost nova and nitro boots away ! Or just blink away. Keep in mind if you try to nova and blink away, can disturb you mates, and that you need to do it enough fast to don't be hitten.
Nothing special to notice in heroic mode. But don't be hit by beasts, it can be deadly !
Place yourself fine before the start (8m from your mates) and as far as you can from the boss (he will not move a lot and this is convenient for the beasts).
Switch on beasts asap with your complete rotation, it's you job to killing them ! If the beast you are attacking is low put your Missiles on another target.
Nothing special to notice in heroic mode. But don't be hit by beasts, it can be deadly !