modifyIncomingDamage
Applies the surge's damage reduction to an incoming hit. Called from the armor skill pipeline in PlayerDamagedByEliteMobEvent.applyDefensiveSkillBonuses() so the result is covered by PlayerDamagedByEliteMobEvent.MAX_AGGREGATE_DEFENSIVE_REDUCTION.
Return
The reduced damage, or the original if the surge is not running
Parameters
player
The player taking damage
originalDamage
The damage as it stands at this point in the pipeline