Unfortuantely the Origins are in many cases excluded from party banter - and I can't see any pattern for when they are excluded and when not. For example for Origin Gale in Act 3 you do get the bit in which he promises Karlach to enchant her a flying axe, but their banter in the Blushing Mermaid about who buys drinks does not trigger. It's just weird.
And while Halsin might have a purpose in Act 3. I do like him well enough until the begining of Act 3, so I'd rather leave him behind and keep his character intact than take him along and ... well, there is more than one thread about it.
