No problem, I'm sorry you had to go through that, I will make sure no more violence happens here again.
An employee is attacking a co - worker because the co - worker was not able to finish his part of a project they were assigned.
The employer is walking around looking for the 2 employees he assigned the task to. He finds them and witnesses one of them being attacked by the other. The employer takes the immediate course of action.
After the fired employee leaves, the employer apologizes to his employee for what happened to him and promises to make sure that what happened to this employee won't happen to anyone else in the office.