Manager will have time to practice accuracy because SubWoke will very likely fire him for having a gun in their store. If it's a franchise they might threaten to pull their license.
These chains consider dead employees a small price to pay for toeing the politically correct line.
That’s the sad reality. There is no, “We’re so glad you were armed that day in defense of yourself and others.” It will be a strict “You broke the policy, so now you’re fired” type of deal.
The SOB could have been mowing down everyone with an AK-47, and the employee saved many lives, but it wouldn’t matter to HR and the lawyers.