You trolling me?You should be more specific as to what you believe is not working, what testing you have done to verify your assertion and what the exact difference between expected and actual behavior is if you would like to be of any help.
Agreed this bug is very aggravating, hope they work on fixing this and the other NB skills that are bugged soon!
Leeching strikes would be a great start but that is only the tip of the iceberg when it comes to how broken/bugged Nightblade class abilities are.
Assassination:
Death Stroke <Incapacitating Strike> and <Soul Harvest> On occasion the animation will happen however the ability is not actually triggered.
Assassin’s Blade <Killer’s Blade> and <Impale> – On occasion the animation will happen however the ability is not actually triggered. These abilities are also bugged in that they cannot crit. This may be fixed in 1.1
Haste <Focused Attacks> and <Incapacitate> – The attack speed increase of 30% doesn’t affect bow weapons.
Mark Target <Reaper’s Mark> – The gain damage bonus effect does not appear to work.
Mark Target <Piercing Mark> – Allows you to see and attack targets who are sneaking however not targets that are invisible currently.
Teleport Strike <Ambush> – On occasion the animation will happen however the ability is not actually triggered.
Shadow:
Shadow Cloak <Shadowy Disguise> – Approximately 25% of the time this ability does not trigger any of its effects.
Shadow Cloak <Shadowy Disguise> and <Dark Cloak> – On occasion you wont visually be invisible but you are to the mobs.
Shadow Cloak <Shadowy Disguise> and <Dark Cloak> – Your character becomes invisible however enemy players can see particle effects and thus be able to locate your player.
Veiled Strike <Concealed Weapon> – The 22% movement speed in stealth while slotted effect appears to suffer the dreaded “Once you’ve died you need to re-log or zone to rectify the issue”. Workaround: If you re-log or change zones it will force the passive effect to work again.
Veiled Strike <Surprise Attack> and <Concealed Weapon> – Often the animation and stun effect will occur but no damage is done to the enemy.
Path of Darkness <Twisting Path> and <Refreshing Path> – This ability appears to be affected by terrain, the magicka cost is spent however the ability does not trigger.
Aspect of Terror <Mass Hysteria> and <Manifestation of Terror> – The base fear effect of 2 nearby enemies doesn’t appear to last the suggested 4 seconds all the time. It is often between 1.5 – 4 seconds.
Siphoning:
Strife <Funnel Health> – On occasion it doesn’t apply to anyone.
Strife <Funnel Health> – Doesn’t appear to be healing allies for the actual amount it should be, inconsistent heal effects.
Cripple <Debilitate> and <Crippling Grasp> – The dot effect of this ability does not work on mobs that are immune to snare effects.
Siphoning Strikes <Leeching Strike> – Only gives an extra 2.4% health instead of the expected 4%. This I've confirmed myself.
Drain Power <Sap Essence> – Is unable to perform a critical strike for both the damage and healing component of this ability.
Drain Power <Sap Essence> – Will not cast the heal effect unless the enemy is being damaged.
Drain Power <Sap Essence> – Heals only for the base amount, and the +20% heal per target hit is never applied.
Magicka Flood <Passive> – Gives 8% max magicka at level 2 while siphoning ability that is slotted. This passive doesn’t detect the siphoning ability swallow soul which I've personally confirmed.