people with the speed of sound do not disappear like in this scene. trace should appear. It may be MHS+, but as I said, I think it's like in that photo. Kokushibo disappears where he stands. If you slow down and watch the video, you will see that Kokushibo has been deleted from the back. But there is no sign of movement until it is deleted. There are many characters that can teleport like this. If that was our speed, it would show traces of movement like Akaza and other characters leaving after this scene. If you watched the entire episode, Akaza leaves a trail as he leaves, but it was obvious that there was speed in this trail because he was moving towards his destination, creating a particle effect. As further proof, Kokushibo comes to Akaza's side to stop Akaza from attacking Douma, while Akaza, Douma and all the other demons don't even notice he's coming, so Akaza is surprised and Kokushibo was away when he got there. He must jump there without making a sound because Kokushibo's position was far and low. Kokushibo was quick enough not only to come near Akaza, but also to cut off his arm and remove his sword and put it back on.