Fancy Footwork achievement what am i doing wrong?

[boss302880]

I can't get the Fancy Footwork achievement. The description reads: Defeat Gortash in Wyrm's Rock without activating any traps.
I tried destroying traps before fighting him, but i still didn't get the achievement even if i din't activate any traps while fighting him at the top of the castle and his goons earlier. The only "trap" taht always activates are the 2 barrier things behind him that buff him.
Do I have to completely destroy every single trap before his speech so that nothing activates when i fight him later? I tried different things across like 3 runs now and still nothing works.

[Moonbane]

Fancy Footwork
Defeat Gortash without triggering any traps. If you want to fight him normally, save before this method. As of Patch 7, a hilariously cheesy method for this achievement exists.

Spirit Guardians makes Gortash run in the opposite direction. Use this finicky method to “repel” him out of his coronation room, downstairs, into the hall on the left, and to the right toward Lower City’s bridge. You can knock him off the bridge to his instant death, or kill him however you want without worrying about traps or buffs from his allies.

It’s easier to cancel the Spirit Guardians when going downstairs and re-casting it while standing appropriately far enough behind him so that he doesn’t go back upstairs.

[Amaterasu_Nyan]

I had to one shot him with a bunch of smoke powder barrels and runepowder on the first floor to get the achievement.