Teratotaur doom mechanic

the fight in the temple of the quarn dungeon against teratotaur for stepping on the tiles to get rid of it can be completely avoided by ranged by standing on a pillar in the room. the whole room is engulfed by the doom circle but when on the pillar you avoid it completely. if this fight mechanic can be avoided then the fight itself is not being done correctly.

is this mechanic standing on the pillar for ranged to avoid it completely working as intended or is it a actual bug that started with the new jump option in the game.