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QUICK TLDR GUIDE
Split the raid into two teams with one tank, half of your healers, and half of the dps.
These teams will go left or right when Flood of the Firelands spawns.
Flood of the Firelands must hit at least 4 players. If it does not, the room will fill with lava.
The melee hitbox on this encounter is very large. Melee DPS do not need to stand on the edge of the platform.
Tanks: Swap when Cataclysm Jaws is cast. Ensure you have 0 stacks of Molten Venom.
Tanks: You can either swap on the cast (but take more damage from Molten Venom) or swap ~25 seconds before Cataclysm Jaws and then taunt for the Jaws cast.
Tanks: Make sure you are in range of the boss to be attacked. If no player is in range, Volcoross will cast Combusting Rage.
Avoid Scorchtail Crash. This will spawn a shadow on the ground before it hits. Move out of the shadow.
Heroic: After the tail hits the ground, Tidal Blaze's will fire from the impact point. Avoid these.
Avoid players with Coiling Flames. This will deal more damage the smaller it is.
Healers: Focus on players with Coiling Flames as they will take increasing amounts of damage.
Flood of the Firelands will knock you away from the center of the area. Ensure you get knocked in a safe area.