Does Swift Cast work on any skills?

[VanilleFang]

A flat 5% DPS decrease seems like a weird way to look at a slow, especially in a game tied to a 2.5 second global cooldown. Now I may not be super knowledgeable about how all this dps stuff works but if mobs are also tied to a 2.5 second cooldown...

Say you fight a mob that only uses instant abilities every 2.5 seconds, casting a 5% slow would delay its attacks to every 2.625 seconds. Taking these numbers, plus the duration of Shadow Flare(SF) you can sort of calculate dps. For the sake of this equation I'm going to say the mob deals 100 damage per attack.

@30 seconds, and 2.5 GCD, the mob would execute 12 attacks (30/2.5=12), and would inflict 1200 damage (12×100=1200). Which can then be calculated as 40 DPS (1200/30=40).

@30 seconds, and 2.625 GCD, the mob would execute 11 (rounded from 11.42~) attacks, inflicting 1100 damage, or 36.67 DPS.

36.67 is about an 8% decrease from 40. So you actually reduced the target's DPS by more than 5%.

But if the mob died at 29 seconds it would execute 11 attacks regardless if it was inflicted with SF or not. So the dps would not be any different, since in both cases the mob would inflict 1100 damage, or 37.93 DPS.

This is all napkin math and I'm actually work so I may be completely wrong, but slows are not the same as actual damage reduction.