Distance factor: Chase bank is approx 150 yards from PP. King Super's front door, on the SOUTH (opposite) end of the center, is even further approx 250-300 yds away, I'm sure some people did hear something, but unlikely they could see very well what was happening.
Correct on the people at King Soopers being unaware of what was happening. They knew something was happening because the man that drove there that had been shot. But they weren’t hearing what was happening. Witness there said that he tried to leave the store after finishing shopping and was turned back by management, that a police activity was happening and they needed to stay inside.