[GAMEPLAY] Nasus Q does not register on champions with Warlord's Bloodlust Keystone

I noticed that late game during teamfights, Nasus Q (Siphoning Strike) empowered autos on champions dealt only around 200 damage to the adcs (Lucian and Ezreal) even with 600 stacks on Q. They both had no armor items, meaning they had low physical damage mitigation so there was no way they were reducing the damage from Q by any significant amount. The 200 damage is probably attributed to a normal autoattack with the Iceborn Gauntlet active, meaning that the Q wasn't registering on champions. Nasus Q however still worked on minions and structures, dealing the full amount of damage. I didn't have this issue when playing with Grasp of the Undying and only came up when I switched to Warlord's Bloodlust.

As a side note, possibly unrelated was that the enemy adcs commented on how my E (Spirit Fire) dealt an abnormally high amount of damage. Might just be them complaining but felt I should put that in.