Short story: He was working when the Guy in the Mask came in, and had to empty the cash drawer under threat of presumed weapon. He diverted the robber's attention from his co-worker by keeping eye contact. The guy left, and he was able to call 911.
He's understandably in shock right now, and needs hugs. The company will be supplying counseling. Any virtual hugs, good energy, et cetera, that can be spared, would be appreciated.
Post-traumatic stress is the worst, especially when we think we should have been stressed more during the trauma itself, and aren't expecting the aftereffects...