Aww, the little boy didn't even have shoes. And he was super fast too! Out ran his teacher! I look forward to hearing about them all in the JA 4x100 team in Olympics 2032.
There's a strong chance that he probably just took them (his shoes) off, as this may be his preferred running style. I used to do that too as I kid. It def made me run run faster.
Most children's games involve going back and forth rather than continuing in a straight line, so that might explain it. Also, maybe in training they run relays back and forth??? but you have to love that child, he ran so fast!