[Mage Tower] Corrupt Risen Mage insane damage

[Skizzo*]

WoW Freakz link: https://www.wowhead.com/npc=118491/corrupted-risen-mage
Bug description: The mage tower for restoration dudu has this mob, which one shots your allies, obviously it should not do this since you need ur allies to stay alive, on retail its dmg didnt surpass 3 mil even when enraged, here it deals 5 mil when enraged, one shotting any ally it targets
Proof: Proof of the max dmg and min dmg it dealt with arcane blitz: https://imgur.com/a/eohfcRn
https://youtube.com/watch?v=BKJJYhtpJ1w:


at 0:38 first encounter with the mob on retail, not once during the whole fight did the allies take more than 2 mil from the mob
im unsure whether the scaling is wrong or if its something else, also mana sting from corrupten risen arbalest doesnt work, not doing anything (here on freakz)

Update @ 19-06-2020, 14:02:52

i forgot to point out no dmg reducers were used on anyone in the video, except bear form for the druid