I've only tried this with one core(Orange) and one server(who wont be mentioned) so far, but here goes.
In ICC 10(Haven't tried 10H, 25 or 25H) if you pull Lord Marrowgar to Lord Tirion Fordring and have him get the killing blow(Tirion HAS to get the FINAL hit on Marrowgar or you'll get saved) on Marrowgar, you'll get the loot, badges; but wont get saved to the raid, use the raid reset method(10>25>10) you can do this with all the trash to farm rep too, not the fastest way to farm Frost Emblems or Ashen Verdict rep, but for those servers where you can't get them very easy, this is probably the best way.
I'm waiting for some repairs they are doing to their servers since they just got attacked, and I'm going to try it with Deathwhisper too.
The servers which don't have his leash fixed you may do this on, the orange cores I've seen have not done son.
-Marrowgar will keep following you if you hit him every so often, a quick ice lance as a mage and he will still follow you, I guess depending on the server owners care to fix it.
-Trash can be pulled the same way down to Tirion, and the Guards/Tirion will tank them for you, as long as you tag it, you get the kill credit.
-As a mage you can blink through the doors if they are there and the server owner has lacked to fix the doors, as I've seen, orange core servers don't have the door to marrowgar.
-If done correctly you can get 2 EoF every 10-15 minutes.