Hunters can use Mark even if i use Cloak of Shadows. Mark is magic like druid spell Fearie. I know there is a 10% but druid spell resist me like 9/10, and hunter mark like 0/10.
How it should work: CoS have 90% to remove or resist spells or magic, but on Icecrown can't resist hunter's mark.
Fearie is magic like Hunter's Mark and didn't do any dmg.
So I wan't to tell you that any hunter can mark you while you are in Cloak of Shadow's, no matter if they have only 10%.
Druids fearie will resist you like more time when they cast it while you are in Cloak of Shadow's.
Because cloak of shadows is indeed a hard bugged ability on wotlk and blizzard just put 100% resist in cataclysm. Sometimes 90% resist will resist all abilities, sometimes you get hit by all. Nothing surprised to see there.