Blood Weapon duration inconsistent with Delirium and Inner Release

[Aloise]

Date & Time: July 12, 2019
Frequency: Always
World name: Exodus
Character name: Aloise Nel'hah
Retainer name: Driene
NPC name: N/A
Monster name: N/A
Class/Level: Dark Knight, Level 68+
Party or solo: Either
In-game time: N/A
Area and coordinates: N/A
Housing: N/A
Steps:
1. Gear your Skill Speed to have a GCD of approximately 2.43, +- 0.02s.
2. Press Blood Weapon.
3. As soon as animation lock allows, press any 5 GCDs as quickly as possible.
4. Note that the fifth GCD's MP + Blood generation is extremely inconsistent, erring on the side of not getting the final GCD under Blood Weapon.
5. Press Delirium.
6. As soon as animation lock allows, press Bloodspiller 5 times as quickly as possible.
7. Note that Delirium never has any problems landing all 5 GCDs.

Delirium and Warrior's Inner Release share the same duration, which is seemingly an entire second longer than Blood Weapon. Despite the tooltips for each ability claiming to be 10 seconds, the reality of the situation is that Inner Release and Delirium last longer than Blood Weapon does. Warriors with good connections can get 5 Fell Cleaves inside of Inner Release with a 2.48s GCD. Getting 5 GCDs under Blood Weapon is entirely impossible with a 2.48s GCD.

An alternate method of confirmation:
1. Press Delirium
2. As soon as animation lock allows (approximately half a second), press Blood Weapon.
3. Note that the time between gaining the Delirium buff and the Blood Weapon buff is exactly a second and a half. This can be verified with a video recording.
3. Allow both buffs to run their full duration.
4. Note that when both buffs fall off, the time between them falling off is exactly half a second. Again, verifiable with a video recording.
5. Do some simple math. 1.5 - 0.5 = 1 second extra duration on Delirium.

If the two buffs were the same duration, you would expect the time between the buffs falling off would be the same as the time between them getting applied, plus 0.6s of animation lock. This is painfully not correct, and Delirium lasts a full 11 seconds compared to Blood Weapon's 10 seconds.

Connection Specs
- Type of internet connection/provider: Comcast
- Modem maker/model number: Xfinity XB6-T

■ PC Specs

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[Aloise]

Updating with actual video proof, as "You can prove this by recording video" doesn't literally demonstrate the problem. Here is a video timing the two buffs. The timer is started and stopped based on the buff appearing and disappearing from my buff bar, not from the floating text appearing or disappearing. The time disparity between these two durations is too large to ignore.