Keeper Action card - Unwilling Test Subjects
Action: Once per turn, you may either
Discard 1 mutation token from a monster to heal 2 damage from another monster in its space,
Give an investigator in the same space as a Cultist 1 mutation token.
What does "heal 2 damage from another monster in its space" means, it like trading one mutation token for 2 health while other monster ( in the same space) suffers 2 damage?
The card means just that. If a monster has a mutation token and another monster in the same space has 1 or more points of damage, you can remove the mutation token to heal/remove up to 2 points of damage from the monster in the same space.