Beyonce is a pampered princess who has to adopt an alterego anytime she even thinks about doing something even remotely controversial/risky/dangerous. What makes anyone think she would have the necessary the balls, confidence, or power to take on anyone in a fight, much less a girl who has proven she can take a hit.
The only way Bey is winning is if Matthew has his hitman "take care of business" which, frankly, I'm surprised hasn't already happened.