Using "behind you" on a marked enemy without killing it no longer resets your cooldowns on the TC. You might want to modify your build to account for that
The thing you said about Relentless Assassin, not sure whether it's "unstated intentional" or "bugged". Don't get me wrong, I'm also enjoying it, but it MIGHT be a bug as it gives an option to spam Behind You...
resetting slip into the shadows is the thing that makes me think it's certainly unintentional behavior; there's just no way they intended the 30s dps cooldown to be spammable. The fix might just be to remove that from the relentless assassin reset in the way they did with the signature, though
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