I can confirm Randomizer's report - game still crashes after I attack Siam and he attempts to cast an offensive spell.
I tried attacking him with both Mugile my Fighter and Ballassar my Mage - crashed either way when Siam attempted to cast his attack spell.
However, I don't think it crashes quite as quickly in v1.05 as it did in v1.04 - in v1.04, it would immediately dump out of the Book I app when Siam cast; now in v1.05, it seems to take up to a second before it dumps out of the app. And Randomizer is also correct - now you get to see how much damage you inflicted on Siam (and maybe reports of people hearing a crime committed? - it still dumps out too fast for me to be sure about that). So I think it's this bug is now "better", but it still crashes.
On the plus side, Ballassar's attempt once again confirms that I am now able to cast offensive spells on NPC characters on my Mac laptop (thank goodness for Option-Shift-Click!!)
NOTE: I also tested Gruzz - I could not get the game to crash in either of the two dialogue iterations where you threaten Gruzz, so I would say that bug seems to be fixed.