According to Ross, the accuser was visibly intoxicated and continued to bother members of the WWE roster. He was warned by Randy Orton to go away but he continued to bother Henry, even grabbing his shirt and taunting him with explicit language.
When the bar patron asked Henry to take a picture with him or else, things escalated and were broken up by Randy Orton, John Cena and security. As security was taking the drunken patron away, the patron continued to shout at Henry which resulted in Henry throwing an empty glass at him that "missed him by miles".
BTW Ross is some guy who was a witness who saw the whole thing happen at the bar.