Might just be me overthinking it but during the first half of the video, I noticed that Bachikin, Otsukin, Jack and Syumitaro all took turns trying to take down Marikin which was why he was able to take down all of them individually. It was only during the second half when all four of them plus Koritora seem to work together did they finally got the upper hand. Really cool detail there and cool animation by the way.