While the players on the front lines of the football teams mingle, a kicker dressed in a white and yellow jersey kicks the football.
A ball is kicked while players mingle.
The football is a ball; since a kicker kicks it, it is kicked; 'while players mingle' has already been established.
This refers to part of the description of a kicker dressed in a white and yellow jersey kicking the football.
A Kicker would be the one who kicked a ball.