15 health is substantial when it comes to the Scout. It means rockets, huntsmen, grenades can 1shot him, and thats a huge factor in battle. The gain is a ball that takes 15 seconds to charge again, misses often and causes a stun for usually 2-3 seconds. Its not a huge advantage and is unreliable. I personally think it needs a buff to the ball, to the long recharge and the very short stun. It could be used in effective tandem with the taunt kill, like Holiday Punch but unfortunately lasts to short to do so. I would personally make the ball a 12 second recharge (also buffing Guillotine combo) and make the stun duration 2-9 seconds. This would be a far better trade off because often shooting the ball is wasting both hitpoints and a moment to use the gun for a few shots. The extra time would be substantial enough to score a shot and actually matter in a duel, the recharge makes for reliability and allows guillotine combo to flow.