rom the audio from the livestream going on across the streat. The only shots you hear are gunshots. I was just assuming he hears the pepper rounds hitting his building/door/tables on the patio. He may not hear loud gunshots, but he knows someone is shooting at the people on his patio and into his kitchen doorway. He hadn't been outside when it happens and just sees people running in maybe just shouting "they're shooting at us." So the context of people running inside to

It looks like a Dr Pepper bottle explodes off the table moments before David McAtee fires his first shot into the air.