Video shows the man, identified as Anthony Charles Thomas Maxwell, running up to the stage as Beyoncé and Jay-Z themselves were exiting. Fortunately, he was intercepted by a group of backing dancers and detained by venue security.
According to TMZ, Maxwell briefly made contact with JAY-Z, but neither JAY-Z nor Beyoncé were injured.
Maxwell was cited for disorderly conduct, but was not taken to jail. Update – August 27th: According to The Associated Press, Maxwell was arrested and charged with simple battery.