But he is partly incapacitated compared to his usual state. He's a lot less resilient with only 1% of his full hit points. His offense is not directly impaired, but his ability to survive another fight is significantly impaired.
That sounds a heck of a lot more explainable with intangibles, than with combatants constantly getting incredibly specific wounds that do not impact their fighting ability, skills and movement, but somehow decimate their ability to avoid getting killed.