1#
He still get's the kill
2#
If an enemy does 1k damage, and you have 2k hp it's 50% in damage to your health. So then the limit meter will fill up 1/2 (that is if you haven't gained any limit-"points"). So when you buy a number of HP+'s to a certain character. then he/she has 5k hp rather than 2k and the damage from the enemy is still 1k (if you are in the same area, it can seem that higher hp won't benefit limit's) it deals 20% of damage, you get the drift right?. But when you have hyper or tranqulizer, hyper: you gain faster limits, faster attack speed, tranqulizer: you gain slower limit, slower attack speed, better "aim".