Knockout has a somewhat similar issue. If you kill the enemy you melee depending on their HP threshold...it won't activate knockout. So there will be times where you basically have to shoot the enemy with your primary just to activate it, even though it more than went over the threshold in pve.
In pvp as well, despite meleeing a target to proc knockout and the targets shield being broken...(which is in the description of the perk) it won't activate. This has been the behavior of knockout since they nerfed it to not refresh on kill months ago which really can get in the way of it's consistency.
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I noticed that. I also noticed that Knockout messes with the range at which you can trigger Thunder Clap. If Knockout triggers you can’t use Thunder Clap at point blank.