The door is opened by your girlfreind Lizzie. She's not a football fan, but she is intrested to see the transformations go. You invited her to try and get her intrested in football.
You explain the Loki statue and the intended rules, and Lizzie gets an idea. "I know a tiny bit about football, so how about this? Each time a player on the other team scores, the supporters of the team they scored against turn into the mascot of the team that player last scored against."
"Liz, that's brilliant!" you say "We'll make a football fan of you yet!"
At that moment the doorbell rings "That'll be the boys. Let's see if they like your idea."