I'm currently uploading a video of me in the Shattered Throne, slowed thrall room. There should have been 5 or 6 Perfect Fifth Kills added to my catalyst. Zero made it. So frustrating. Will message again with video, and a message to Bungie Help on Twitter.
Thank you.
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Kills by direct impact and explosion of Perfect Fifth shot do not count; only the kills by the slow burning effect caused by the Perfect Fifth explosion do.