Can't Do That While Stunned (10 player)

Can't do that while stunned
Can't do that while stunned
Can't do that while stunned
You are dead

I love the name of this achievement.

It's a reference to, of course, not being able to do anything while stunned, actually a complaint well-heard among the Shaman community who has a mild lack of CC-breaking moves. On the forums you may occasionally see someone complaining about PvP and saying "Can't do that while stunned" on the same post a couple of times in order to simulate a stunlock. (*shrug*)

I love it, because the boss uses lightning moves very much like a Shaman... Soooooo... :D

Do not allow Stormcaller Brundir to finish casting a single Chain Lightning (base ability) or channel a single Lightning Whirl (1 other boss down ability).

Brundir can be stunned and his spells can be interrupted by other means. The 1 second cast time on Chain Lightning complicates interruption. Killing Brundir first ensures he never casts Lightning Whirl and reduces the time he must be kept stunned / interrupted. A downside of this approach is that this forces the raid to kill Runemaster Molgeim or Steelbreaker last, which are both considered hard-modes.