What should factory employees do to threaten administrators?

I am the director of this factory. Yesterday, one of my team leaders (male, only 19 years old) had a conflict with his employees (male). The employee almost hit the team leader with the steel bar in his hand in the workshop, and said threatening words: "Wait, I won't let you go. . . . "Threats like this. After my investigation, I learned that this employee often goes to bed late because he has a girlfriend recently. He said that he had no spirit at work, so he had to ask for leave. Now all factories are the same, because the Spring Festival is coming, factories with large orders will be very nervous to catch up with the goods, and our factory is short of manpower. ) and the team leader, standing in the company's position, shows that it is urgent to catch the goods now and can't grant leave. Moreover, the team leader also communicated with him with a sincere and cooperative attitude, but the employees were still unreasonable. . . . Then the company's solution is to give employees a little punishment and dismissal. But what about the safety of this group leader? What should I do if I go out one day and get revenge from my employees? So please ask some experienced management friends to give some valuable advice on this issue!