Regarding the delayed effect of Seer's tactical skills

Anyone who uses Seer would notice this immediately, and I think developers would notice it even more.

I couldn't check it at the shooting range while playing solo, so I haven't checked it.

Did you really consider what happens if you acquire a perk that reduces tactical cooldown while using your ultimate ability?

I understand what you're trying to do, but please think carefully about whether you're making any mistakes in order to implement it quickly.

The ability that should really be implemented is simply the ability to remove buffs applied to enemies while they are using an acceleration skill.

In short, all you need to do is implement an effect that returns the character's movement speed to normal; there's no need to add a slow-motion effect. The only reasons you can't implement it are time constraints or your lack of skill.