We just ran through the hard raid and managed to detonate all orbs at the same time.
Oryx didnt take any damage whatsoever.
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I Had almost the same problem with my raid team we did 16 bombs and only 12 detonated, then we wiped and iT was showing that all the 16 bombs were detoneted. Golgoroth same frikn thing diddent got the challange. -.-