I was there, here is a quick summary. I heard conflicting conditions but he had blood coming out of his mouth and an employee had a gauze roll held to the back of his head. I overheard one guy say there was no exit wound, but another said there was. From the sounds, they performed CPR and eventually had a vacuum tube to drain some of the blood, he appeared to be alive when he left.
As for what happened, no one knew (or was saying) exactly what occurred even though he was in the middle of about 20 people. When the police arrived we were not allowed to leave. At first we were told that all guns may have to be taken until the caliber of the bullet was determined, but they let (at least some) of us leave with everything after taking statements.