Ouch, They Got Sick

''It just ever so happens that the best player on our team can't show up. We gotta win this championship, and YOU gotta help us!''

When a person who was scheduled for some important (competitive) event turns up sick, injured, or simply absent for the Big Dramatic Final and the Main has to take over for them. This is the point where the Main can make up for all of their failures in the past while they were training and will have a guaranteed Perfection Moment. They succeed in whatever they're doing and everyone's happy because. Cue Credits.