[Vault of the Wardens] Cordana Messy Creeping Doom

[Skye]

WoW Freakz link: Cordana Felsong
Bug description: Don't know what's causing it, but the creeping doom phased was bugged at least 10 times at this run. The moment she casted creeping doom, we could see the gap for a few seconds, but if we go close to the gap with the light, we will sometimes get knocked back even though we walked into the gap. But most importantly, multiple shadows sometimes appear overlapping making it very messy and impossible to figure out wheres the gap. The shadows sometimes approach the player diagonally (it shouldn't happen at all) and sometimes as a group (instead of a line).
Proof:

Spoiler: