Rule 437.5

Damage can still be assigned to Units in combat that are affected by Prevent. The damage dealt as a result of that assignment will be affected by the Prevent action.

• 437.5.a Damage can be assigned to a Unit up to a value that would be Lethal considering the Prevent Value of all Prevent…
• 437.5.b No amount of damage is ever considered lethal if the Prevent Value is “All.”

Official Core Rules