Thorim hardmode is an RNG fight rather than hardmode, because sif cast's her skills so fast that a raid member loss is most likely, Sif'll cast a frostbolt and volley right after without GCD which results in a dead raidmember in 1.5seconds or so.
As you can see on the video below sif wait's around inbetween casts.
I've counted sif casting frostbolt volley after casting a frostbolt and the fastest had 4 second inbetween.
which you can track on the grid/raidpanel of the frostbolt's and volley's slow effects.
Thorim hardmode is an RNG fight rather than hardmode, because sif cast's her skills so fast that a raid member loss is most likely, Sif'll cast a frostbolt and volley right after without GCD which results in a dead raidmember in 1.5seconds or so. As you can see on the video below sif wait's around inbetween casts.
I've counted sif casting frostbolt volley after casting a frostbolt and the fastest had 4 second inbetween. which you can track on the grid/raidpanel of the frostbolt's and volley's slow effects.
https://youtu.be/8BTLfOHyMaQ?t=250