This mutation could be considered a direct upgrade to Ygdar Orus Li Ox, as it typically stops situations where the player would die while simultaneously not permanently taking up space in the mutation slots and being reusable.
Disengagement will actually heal the player up to 20% if the player is below 20% health, has allowed the cooldown time to pass, and then takes damage with the mutation active once again.
Disengagement will not activate when the player's health is slightly above 20% and an enemy's attack does more than their current health percentage.