The point of the spell card system - what danmaku are a part of - is so people don't have to die. So humans can duel to fight off youkai, and so youkai can leave with their lives if a human is trying to exterminate them. So that youkai can still cause mischief, but humans can prevent it from getting too far. Things like that. It was designed to be nonlethal from the very beginning.

It's a function of society, a way of life where I'm from, not a weapon. It's...a little difficult to explain to someone who doesn't know what it is.