it was a match where rakuzan played against your team Seirin High, you were playing in kiyoshi's place because his leg was injured and couldn't play.
You play against akashi and it was pretty hard to play against the emperor and he wasn't even making it easy for you at all, but luckily you go past him and jump up high to score the ball in the next and you actually score but something unexpected just happened.
As the ball hit the net you also go along with the ball because of your high jump which got you in trouble, you also got inside the net and then fall down into the ground. the whole people who were watching the match laughed out loud meanwhile akashi was standing there with eyes widening, wonder what the hell just happened and are you really that idiot?
He starts to wonder when the world is gonna end, now the Seirin high team regret replacing you in kiyoshi's place, akashi looks down at you as he walks towards you and helps you.
"Did you just become the ball?" He says, still keep his cold expression but you could tell that he was dying inside.