Quote Originally Posted by Saimeren View Post
That's not actually covering up any mechanics though. You can very clearly see the lines and colours through the spell effect.
A flash grenade only makes the room bright for a few miliseconds, but the effect of them can easily last several seconds after that. Thats how it can disrupt vision (and therefor mechanics).

And it differs a lot per player on how flashy it has to be to become disruptive. Yet there is nothing you can do to get around it. Even if the flash isnt blinding, it can be enough to make your brain struggle to notice contrast changes.

(and yes, a flash grenade is the excessive case, but flashy effects still behave in a similar way)