In fact there is no milky.
Each enemy has a defined number of points.
When you have reached the limit, the enemy can no longer give points.
So it's useless to juggle infinitely with an enemy.
In short it's part of the scoring system, the game was designed to maximize its score... made in Japan
That said the technique is not so easy, in most levels it's very difficult to juggle with an enemy because of background and other enemies.
NB: I didn't kill any baby raptor
