The tragic shooting in Aurora, CO, took the theater goers completely by surprise.

This cellphone video captures some of the growing panic, then terror as people realize the shooter was NOT part of the premiere of the new Batman movie. Reasonably, many thought that when the shooter entered the theater via an exit door, he was part of the event. But shortly after he threw a tear gas canister and began shooting, people realized it was not that. This video captures much of that terror.