Hi there! This game doesn’t have damage, as fights aren’t the focus of gameplay.
If a monster attacks the characters, they’ll most likely make the move Stand in the Face of Danger. If they attack a monster, they’ll probably do it with magic rather than a knife, so they’ll roll the move Cast a Spell.
If the roll goes poorly for the character, they’ll take a Condition (like becoming Scared or Injured) or other Serious Consequence. If it goes well, the GM determines if the monster is hurt, scared off, affected by a spell, calls for help, or comes around for another attack.
Think about what would happen in the situation, not about damage or hit points.