Someone else on FR mentioned that people that work there know the front desk doesn’t contact the police right away....so... I’m guessing after he reported that he had been shot he called someone close to him. Maybe the person that was yelling in the crowd?
I think most people after being severely hurt want to contact a loved one as soon as possible. Surely he had a cell phone on him.
They only call after the 201’st round is fired, so he was under the limit.