As of the Edge of Fate, enemies slowed by the bleak watcher aspect seem to be extremely inconsistent at activating kill-based weapon perks like demolitionist. This seems to be specific to enemies slowed by bleak watcher only - once they freeze, things become normal again.
In the following two videos, you can see this in action. My glaive has enhanced Demo + Wellspring, and i have feed the void devour. Normally, one kill would net ~50% grenade energy with this setup, but when the target is an enemy slowed by bleak watcher before killing it, it only returns a small chunk about half of the time, which shows me that only devour is activating, not my weapon perks.
Demonstration with rime-coat raiment equipped: https://www.youtube.com/watch?v=6HjMGjb6VnI
Demonstration without rime-coat raiment equipped: https://www.youtube.com/watch?v=b0kvviEwXJo
I've provided videos of both with and without rime-coat raiment, because it is also bugged and creates a similar effect. This should show that the bug that is the subject of this post is specific to bleak watcher as a whole, not rime-coat raiment.
Here is a demonstration of an identical setup but with no bleak watcher to show that this bug is bleak-watcher specific and not just an issue with my setup or the game at large: https://www.youtube.com/watch?v=HuA3SHpwA20&feature=youtu.be
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Hi there, We'll pass this post along to the developers for further investigation.