Final answer:
A terminated employee threatening that a supervisor will regret it can be categorized as workplace violence. The severity and response to such a threat would vary based on the perceived risk and context. Safety measures and reporting the incident within the organization are crucial.
Step-by-step explanation:
If a terminated employee shouts that the supervisor would regret it as they leave the premises, it is an example of workplace violence. This kind of threat is categorized as verbal abuse, one of the forms of workplace violence that also includes physical assaults and other threatening, disruptive behavior. Generally, the immediate reaction should be to ensure safety and report the incident to the appropriate personnel within the organization. However, whether this specific situation warrants calling 911 would depend on the perceived severity of the threat and whether there is an immediate danger to anyone's safety.
In considering the emotional state and potential for actual violence by a person who feels they have been treated unfairly, it's important to take any threat seriously. Employers should always be diligent in maintaining a safe work environment, which means paying attention to signs of intimidation and escalating behaviors that could lead to further escalation of violence.