But you can romance Karlach and Halsin at the same time and Astarion and Halsin at the same time too, so that means they are poly too. How come SH doesn't agree on poly with Astarion or Karlach? There is other explanation though - SH/Astarion/Karlach treat Halsin no more than a fling, casual sex source for Tav and they ok with open relationship if Tav is.
That seems mostly right. SH is fine is she the primary. Apologies if this has already been posted but I just found this on youtube - she also forgives Mizora but asks that Tav consult with her first. She also mentions that she had many flings while being trained as a Sharran:
So yes, as I said, if you treat Halsin's thing not as proper romance , but fling or just casual sex - it makes much more sense with all her dialogue in act 2(her denying poly proposals). She is just ok with open relationship(just like Astarion/Karlach) if Tav is ok with that, but remains mono.
