Function get_damage_after_absorb 

pub(super) fn get_damage_after_absorb(
    victim: &(impl LivingEntity + ?Sized),
    damage: f32,
    source: &DamageSource,
    total_armor: f32,
    armor_toughness: f32,
) -> f32

Returns vanilla CombatRules.getDamageAfterAbsorb.