Answer:
first forbid him with talk then with fight.
Explanation:
If you observe someone is making another person uncomfortable so first you request him not to do such type of things, if he understood so it is good but if he is not willing to understand then intervene in this situation by the use of aggression. If you avoid these types of situations, then these bad people will be encouraged because they thought that no one can intervene so you must take a stand by fight with them.