Thoughts on interject.

[Shurrikhan]

Haukke Manor does this actually.

The final boss has a few casts that can be interjected. On top of that, the eye that comes to her and gives her the damage immunity also has that cast interjectable. It'd be nice if more bosses did this.

There's no need in that fight to Interject any of them save certain AoEs and Stoneskin, though. Pre-HW mob casts can't turn mid-cast; they can therefore be interrupted by just... walking through them before the cast snapshots. On that note, though, Ice Spikes on the 2nd boss can and should be interrupted, and certain interrupts on the first boss can save casters from having to move.