What would you expect human resources to do in situations of workplace conflict?​

Managers (and observers) often do not know when to get involved in workplace conflicts. How does one distinguish between a situation that constitutes violence or aggresion and one that is just normal workplace violence? Provide an example from your experience of where you were involved in (or witnessed) a workplace conflict. When do you believe a manager (or witness) should intervene in a situation between coworkers? What would you expect human resources to do in situations of workplace conflict?​