Perhaps its a magical sword that cauterizes the wound. In any case it is not a terrible thing as her raw damage effects everyone the same. Bleeders and nom bleeders she still hits hard
If she caused bleed she would do a ridiculous amount of bleed because of how much attack she has. Can't have anyone with a bleed that's too powerful... Oh wait we have Domino, never mind.
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There are a few champions that don’t deal bleed with their swords. Hela, Blade (kind of) and Psylocke come to mind.