Denki had lost his first match and was taken to the hospital ward of the building because he had short circuited..

..meaning that you were kinda bummed that Denki didn't get to see you in your first 1 v 1 fight at the sports festival.

You could see kirishima and Sero waving from the stands and pointing at a half short-circuited Denki that was trying his best to cheer for you, he looked like a complete dork but it meant a lot to you.