First, most of those mall bathrooms are in an alcove or hallway. At the entrance to those is usually just a section of wall on either side. Second, as soon as the guy started firing, you know people scattered AWAY from the shooter. This gives a probable clear line of sight to engage him with minimal chance that innocents will be running between you and the shooter. With his efficiency, I’m sure the hero micro calculated all this in seconds while engaging.
First, most of those mall bathrooms are in an alcove or hallway. At the entrance to those is usually just a section of wall on either side. Second, as soon as the guy started firing, you know people scattered AWAY from the shooter. This gives a probable clear line of sight to engage him with minimal chance that innocents will be running between you and the shooter. With his efficiency, I’m sure the hero micro calculated all this in seconds while engaging.