Issue
The group pathing/follow function for Halsin breaks after fights.
Disclaimer: I haven't played a ton with Halsin as he recently became eligible to join me on my adventures and thus I have very limited data. I didn't experience any issue during his quest-line (one fight) and I'm not sure whether or not he participated in any fight after his quest-line (until I noticed that the kept breaking).
I have tested it on a few fights in the Mountain Pass region. Two fights where AI is using simultaneous actions and one where it's just a single opponent. I've tried one of the fight (Kobolds) multiple time and the issue becomes apparent every time. I also tried one of the fights with Karlach (she has been used extensively during the campaign) and she didn't break.
Also, please note that I am aware that the companion pathing breaks every so often (same goes for enemy combatants in certain areas) but I could always fix that by switching back and forth between characters or using similar actions (I guess: forcing them to recalculate their pathing to the party leader).
Data
Fights tried with Halsin:
- Gremishka
- Kobolds
- Lady Esther(?)
Fights tried with Karlach:
- Gremishka