In warhammer 2 there is a bug for the AI where wind/breath spells go don't go in the direction indicated when the AI tries to aim it. Watching a preview battle video for Warhammer 3 seems to show that it's still broken!Check out at about 5:10
(should start there). Tzeentch aims the breath spell: Pink Fire of Tzeentch one way, but then you see it going in the complete opposite direction.
Come on CA, I reported this bug like a year ago and not only did you not fix it in Warhammer 2, but you've carried it over to WH3. I'm fairly certain it's not just a display issue because I've seen the AI completely wipe itself out with its own Burning Head.