Does Teshem Mutna sword calculate damage before it starts dealing any damage?

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Does the sword calculate all the damage it will do before any damage is dealt or after the first 5 damage is dealt? It makes a difference when targeting units with a shield. Because if it calculates before, then shield is not relevant and it can kill Donimir and a Ciri: Nova boosted to 11-14 power.

If it calculates after, then the first 5 damage removes a status from the unit, which means it wouldn’t deal an extra 5 damage because the unit lost the shield status after the first 5 damage.

I just don’t want to not know before the situation comes up
 
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