Halsin just isn't for me in terms of romance and attraction. What I've seen of his romance it seems pretty fine and wholesome. But if I don't have him as a love interest, there just isn't much to do with him as a companion in act 3, apart from watching him crack walnuts with his ass cheeks.
I like his epilogue and learning about him finding his new purpose helping people building new lives. His little gift is cute and hugging him makes for nice and fuzzy warm feelings.
