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Can't Do That While Stunned (10 player)
Defeat the Assembly of Iron without allowing Stormcaller Brundir to damage anyone with Chain Lightning or Lightning Whirl in 10-player mode.
Can't Do That While Stunned (10 player) requires defeating the Assembly of Iron without letting Stormcaller Brundir successfully cast Chain Lightning or complete a Lightning Whirl channel.
Kill Brundir First
Enter Ulduar and focus Stormcaller Brundir down before the other bosses. Killing Brundir first ensures he never reaches the ability threshold that triggers Lightning Whirl, and eliminates the window during which Chain Lightning must be interrupted. Be aware that killing Brundir first forces Runemaster Molgeim or Steelbreaker to be the last boss killed, both of which trigger harder encounter phases.
Stun and Interrupt Brundir
Stormcaller Brundir can be stunned, and his spells can be interrupted by other means. Chain Lightning has a 1-second cast time, which makes interrupting it tighter than normal, so use stuns to prevent the cast from starting at all. At max level, a geared character can open with a stun on Brundir, follow with an interrupt if needed, and burn him down before stuns expire, as his health pool on 10-player is approximately 3 million.