Actually it's HBJ's fitness that I'm more concerned about, if she pushed herself too hard, the risk of accidental injury is higher
The bump on her knee is obvious, as GC keeps pointing out. For badminton at the highest level, anything such thing can be a distraction or aggravating factor.
He Bingjiao is still junior in status, she doesn't have the standing and privilege to decide or have a say whether to skip, withdraw or retire from any tournament unless due to injury or sickness.