A leading news agency has released the full surveillance video of Solange Knowles' attacking Jay Z in the elevator of the Standard Hotel. The assault took place on the way to a MET Gala after-party on May 5. Beyonce and Jay Z walked the red carpet of that event in good spirits, posing for photographers along the way and even faking a proposal after Beyonce dropped a ring. But something clearly took place soon afterwards... something that led to Bey's sister Solange Knowles brutally going after her brother-in-law.  Show less