Hey,
Do you mean the explosion isn't happening or that the kills aren't giving progress toward the catalyst?
If it's the second, there is an error in the description given. You need to kill enemies with the burn after the Perfect Fifth explosion, not with the explosion itself.
If it's the first, could you provide a video showing this. You can upload it to a public sharing site like YouTube and just post the link here.
English
-
I am dumb, I didn't realize the perfect fifth explosion's burn was what counted. I tried that in this week's ascendant challenge and it worked once I got the thrall in a nice little spot. Thank you for clarifying that up!