No rhyme or reason but either switching the buff there was a chance of him starting the wipe mechanic even when we have the buff counting down. It didn't happen every run but when it did, it happened each DPS.
Makes him unbeatable as you loose 1-2 DPS parts per DPS phases.
We tried changing subclasses and weapons. Nothing helped. Didn't get photos as it happens too quickly.
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I have seen this twice as well. Luckily it was after contest, but still disappointing to have 8 seconds on buff and him to start wipe mechanic.