Q on discordance

So discordance on wizard…
I really dont understand how the attacks works.
Here is my question, i got discordance on with twister with 4 multi attacks, does it mean when i cast the twister the dmg is multiplied or the dmg is occuring 4 more times?
Is it 1 attack with the calculated dmg with multi attack?
Or 1 original dmg then 4 more incoming dmg but less?
So confusing…

I easily unerstand primary attacks with multi attack cause of visual.

Multi attacks will just add to the damage of the skill if you are using doscordance. No added animation at all.