when DK uses lichborne (Lichborne - Spell - World of Warcraft), pally can use turn undead to fear them (instant cast with glyph). Since unholy DK got some nerf, alot of DK will be going 20/51, and they'll be picking up lichborne.
apparently lichborne also makes you immune to hex and sheep, even though not shown on tooltip.
So whenever you see DK pops them, you can fear them on pally, even though on tooltip its suppose to make you immune to fear. Same goes being immune to hex/sheep.
by bighandxyz