Crum Brothers Corp., a steel drum manufacturer, owned and operated a manufacturing plant in Pittsburg, Penn.. Coel Stone, the plant superintendent, hired Pitt Security Patrol, Inc. (PSP), a security company, to guard CBC property and deter thieves and vandals. Some PSP security guards, as Stone knew, carried firearms. Craig Sharp, a PSP security guard, was not certified as an armed guard but nevertheless took his gun, in a briefcase, to work. While working at the CBC plant Craig fired his gun at Don Stew, a CBC employee, in the belief that Stew was an intruder. The bullet struck and killed Stew. Stew's mother filed a suit in court against CBC and others, alleging in part that her son's death was the result of PSP's negligence, for which CBC was responsible.

Please advise of Analysis, Rule and Conclusion.