Battles aren't supposed to be heroic affairs. They are not supposed to be fun or exciting, to us every battle is filled with despair, they are dark, horrifying, grizzly. We should fear warfare, avoid it always and whenever possible choose the path of peace.
It increases the weight of whatever it hits, until my opponent can no longer bear the weight and falls to the ground. And then they bow their head as if in apology. That's why it's called "Wabisuke".