I think Shadowheart being "poly" could be a thing, but just as much I see her more into females in that regard. As with her wanting to be carried by Karlach etc... Which I found strange we cannot romance Shadowheart and Karlach together, seeing as they have good chemistry. As for how I played it; despite the initial heated relationship between Shadowheart and Lae'zel; I could see the three of them all together in a relationship 4way with our "tav" I was a female Drow. So it felt cohesive enough imo.

I'm not by means a Halsin fan, in fact I don't really like him at all and he just feels so very tacked on. I also didn't interact very much with him at all, So I hadn't gotten any voicelines from him either.

At the end of the day, we all have our beliefs and headcanons I suppose.