Question about Final Boss in Grim Batol

[nyxalinth]

I can't think of his name, but today my partner was running him with a group--on Normal--and she said the group wiped because he 'suddenly started making copies of himself' and no one knew how to handle it.  I'm not able to look up patch notes--though I can use LJ at work--so can anyone confirm if he was buffed?  Or bugged? So far as I know, this behavior is more a Heroic thing. She's done GB many times without this happening, which is why she thought he might have had changes made. it's also possible she queued for Heroic by mistake.

Thanks, ladies!