Cool things down

"Matt...we should...just...maybe you could go know…", you say, in total confusion for that awkward situation. Grace puts her hands on the hips "Come on, boy! Why should he leave? He is welcomed to stay here and watch me tumbling you down". "Grace...if I got the name", Matt hisses, "I don't know what the outcome of the fight will be but I must say that I don't like your attitude. If you'd excuse me now, I will leave…". The girl walks resolutely toward him and stands on his front, halting his motion to the door. Their size couldn't be more different. Matt is not hulky as many are in the army, nor he looks full of steroids, but he is indeed muscly. He is 187 cm tall, whereas Grace, who's standing before him, would be 172/173. "Chris, dear…", she tells you staring your brother, "Do you mind if we change our plans? Now that I've got to know your brother I'd like to extend to him our little challenge". You are speechless, and the reason it's not only that she clued your name for the first time. "Don't be ridiculous!", he retorts, "I'm not hitting a girl of your age and size. No matter how experienced you are...I don't know you either…". "See, Chris?", she asks, not diverting her gaze from him, "Cowards. As I said. He is wondering: what if this girl can really annihilate me? My ex did the same. And your big bro is afraid even more since you are watching". "Chris..", Matt says, "Your friend is crazy as hell. Who is she?".