There is a glitch where if a boss hit you with HP% based attack at the same time the boss dies/respawn, the normally non-fatal attack become fatal and kills you instantly. This will not work with regular damage that doesn't ignore invincibility.
This will often occur with normal mode Pierre because Pierre can respawn into another color at the same time using his umbrella rush move.
Since every attack in chaos mode is HP% based, this glitch can occur during bloody queen when she is changing faces while clawing your eyes out and at Pierre of course. (both untested, but possible)
An example outside root abyss would be victor and velderoth. Touching the green orb after victor die, or getting slash by velderoth when he dies.
On a side note, magic crashing the mirror and the queen will prevent the mirror from healing the queen if someone dies to it.
This will often occur with normal mode Pierre because Pierre can respawn into another color at the same time using his umbrella rush move.
Since every attack in chaos mode is HP% based, this glitch can occur during bloody queen when she is changing faces while clawing your eyes out and at Pierre of course. (both untested, but possible)
An example outside root abyss would be victor and velderoth. Touching the green orb after victor die, or getting slash by velderoth when he dies.