I discovered this whilst trying to get back into using dunemarchers for pve, and it appears that whilst you have any stacks of roaring flames, dunemarchers won't proc regardless of if the melee kills or not. Without roaring flames, it works fine, same with offensive bulwark and knockout, I checked those just in case it was affecting all aspect powered melees, but it's only roaring flames. Also, I know it's intentional, but dunemarchers not working with ranged melees hurt its pve uses for some people, I know it did me, I had a little thor build back in the day, it was a lot more fun than the standard synthoceps stuff most people did with the throwing hammer. Looking ahead, with prismatic, 2 of the 5 melee options can't interact with dunes, which doesn't seem fair if I'm being honest. So, would re-enabling this interaction be something you'd consider, I mean, it's far more tame than most of the melee shenanigans titans are doing out there. I'm just saying, if I could run dunes with flechette storm, I might not take that off. It wouldn't even work with every volley, just the first. Sorry this expanded into a little rant, I just really liked dunes a long time ago, and it's a shame to see it reduced to little more than a convenient movement option for titans in the crucible.