gratz on the mount! I hate you though, I've been farming heroic UP for about 5 days and haven't seen the mount drop yet

There is another way btw to do Skadi, which imo I consider one of the hardest heroic bosses. What you do is farm 5 harpoons at the start (just wait at the start of the tunnel and let guys come to you). Then run out to the previous room, the boss disappears. Run your team quickly to the small room at the end, and park them deep inside facing out. Have one of your guys run out near the boss, don't aggro him yet. Drop all your totems, make sure all shamans drop magma totem and your tank starts his AOEs (consecrate, D&D, etc). Now the guy near boss aggros him and runs back to team, while rest of the guys DPS everything (everything spawns at once!). Don't shoot harpoons on the first pass which is after like 15 secs, wait until the 2nd pass (~60 secs) by which time all adds should be dead. Now harpoon him down, tank him outside while your team stays mostly in the room.

The hardest part of this is the transition when he lands. You have to kill any adds up first, keep aggro on the boss, and taunt him every time he is halfway to your team while whirlwinding (and still healing the tank). It takes a lot of practice, and even after 5-6 days now I still usually wipe 2-3x due to small mistakes of not picking up adds fast enough or letting the boss get too close to my DPS.

By the way this method lets you get the 2 achieves (3 min kill, 1 pass grauf) as well.