I wonder if someone breaks that glass in the background to distract potential witnesses. It's almost as if he's giving someone a cue. He keeps looking over, like he's signaling someone. Then the glass shatters. Then, he head butts the guy.

"...the successful annihilation of organized crime's subculture in America would rock the 'legitimate' world's foundation, which would ultimately force fundamental social changes and redistributions of wealth and power in this country. Meyer Lansky's dream was to bond the two worlds together so that one could not survive without the other." - Dan E. Moldea