The powered melee portion of the Felwinter's helm perk is working on red bar minors but not working for major enemies (I haven't tried it on bosses) when using grapple melees or threaded needle. All in all, not the biggest issue, but I hope it makes it into known issues given it has ruined a build I was excited to use. Also, how come Bungie has never had a bug report system. Typing into the forums feels so useless.