Well, using UD, you have chances to kill and tank, we know that, of course. About UD, you use shackle in enemy, and use UD, stun shield and many things of tank to kill the enemy. Different of UE, it's better use against archers, miss everytime the arrows. I see many times, the dagger using UE versus a mage, the effect you have more evasion, but you can't "miss" the magic of mage. :P