i think it meant different. Because of the happenings, he felt the bittersweet feeling of killing. He thought he would feel satisfaction after taking revenge but felt bittersweet instead. I think the ripple on his world means is about his enemies death, being empathetic about them. Or maybe it meant a memory that he will be bringing till the end of his journey.
A ripple in the water will affect the water surface no matter how small it is. So it means that this event leaves a mark in his world, a memory in his journey. It doesn't necessarily mean good or bad, but it's something that he won't forget.
Ohhh ok thx for explaining(づ￣ ³￣)づ
Ah i seee ! I to ty for explaining
Noooo bc of that his world power gonna be weaker ?? Fym by ripple on his world??