Final Steps of Faith - Nidhogg insta wipe even if entire party is stacking

[therpgfanatic]

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Time: 6/7/2016 11: 05 am CST
Frequency: Happened twice
World name: Malboro
Character name: Charlemagne Martell
Monster name: Nidhogg
Class/Level: Paladin lv60
Party or solo: Party
In-game time: 10:05 am
Area and coordinates: n/a


Steps:
1. The phase where after the adds are killed and Nidhogg forms several circles around the map and then creates rings for where he will blast; even if the entire party stacks in the center beneath the rings, he causes an instant wipe sometimes.

The mechanic was functioning normally (as in, party survived) up until the party wiped a bunch during the final phase, so I don't know if it is something that happens with the AI if the encounter runs too long or what.

I think Nidhogg was acting as if we hadn't killed the adds fast enough, but that was not true. We killed the adds before he said his speech and formed the rings.

Connection Specs
Comcast


Model Number of the PlayStation®3 You Are Using
- Model Number: Slim model