How is it that on games like Legand of Kage for the Nes there are so many of them, Ninjas?
Well, They probably don't really die, according or according not to moral and ethics and the ying and yang of clans, these ninjas only pretend to die after getting hit by a weapon. Instead, they fake their death and then, when you scroll away, they come back as if they were new enemies.
They are all cover up to the face so you won't recognise it is the same one.
This is the way of the ninja, to come in small groups that seems bigger than they actually are.
A clever trick! Ain't?