PS4 here. I think Lakshmi was the first place I encountered the duty action button. I had read about it, but at first I didn't know how to fire it. It gives a tool tip when you have the correct trigger pulled, but IMO the skill is not in a conspicuous location.

It's a trigger + a stick. I don't remember which one, but I remember now that I can just check the tool tip when I'm firing other skills.