We've recently hotfixed the Raid Finder version of Garalon, reducing both his health and Furious Swipe damage. In addition, and also exclusive to the Raid Finder version of this encounter, Garalon's Crush ability now has a cooldown, and we’ve corrected an issue with his aggro radius to prevent players from drawing aggro until a player has entered a ring.
With regard to all raid difficulties, after further testing the encounter, we realized that certain abilities were having unintended effects. Blade Flurry, Inferno Blast and Sweeping Strikes were doing double damage to Garalon's body while attacking his legs, which was not intended. We are currently implementing a hotfix, which should take effect after realms are restarted, that will cause these abilities to do normal damage to the body while continuing to do double damage to the legs.source