Yesterday there was a fight at my apartment..

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and it was soo loud and all the people who's staying here get down and watch the scene.A guy was drunken,who is staying at the same apartment(same block)and he brought a big sharp knife threaten that he would hurt someone if they try to stop him.He was drunken a lot and purposely try to make fight with his neighbours.I was soo scared and never go down,i just watch it from my room window which can see him clearly. So i decided to call police to handle the situation,and i did call police.After a while the police took action and caught that guy and brought him for investigation. I have never called the number 999 before.But now,yesterday was the first time i called police and i feel happy to save the situation from becoming worse.