The reason he hits so hard isnt really the passive of losing health. The reason for this is cause his damage is based off his max health value on top of the tai. This is same for water main with monster strength standard, it is also based off max health for damage. Because this event gives buffs for no reason? I mean what's the point in buffing damage if they going to give them 300k health. Just an illusion of being strong and seeing big numbers for fun, which would be ok if some ninja's damage wasn't based off max health.