A Twin in the Glass

I was skidding across the floorboards when I stopped dead in front of the giant leaning mirror! Another bright face was staring right out from the glass! I didn't back down for a second—I threw both arms up, kicked my left heel out, and challenged them to an instant copycat showdown! Every time I snapped into a silly freeze, they matched me without missing a beat! I dropped into a deep crouch, popped right back up, and slapped both palms against the cool glass with a triumphant shout!