Okay, so i watched the video again and skipped to 5:43 this time. I noticed the red icon under your characters UI bar plenty of times. (Red circle with 2 white swords = Damage debuff)
It means they kept lowering your damage. I'm not sure of the juggernaut thing. I'm positive it's not capable of removing stat debuffs. Maybe the mogera thing is a bug because it clearly isn't working in the following video as far as i've seen.
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