"If you're required to perform, you perform," - that works not only in FS, but in show business as well. All stars should be aware of this. That's one of the unwritten rules for the performers. Of course, those celebrities are not skating pros, but nothing near pro level is required from them. By the way, Brooke and Rebecca skated with injuries the same day, it was kinda unfair to them to let Brandon be judged by rehearsal tape. As for risk of dropping the partner - come on, people, they fall multiple times in practices and no one gives a damn.