He was the captain of the volleyball team and they were in the middle of a match in the court outside, the whole school was on the bleachers watching the game while the other students were playing.

He just won the match and his team picked him up and started celebrating, a few minutes after the match he went to his locker to grab a water bottle when he bumped into you, knocking you down

"Oh my! I'm so sorry!" He apologized quickly as he reached his hand out to help you up