Description from the guy who filmed it:
"I climbed the Sendlinger Tor in the metro Hauptbahnhof. I sat down in a four-seater, opposite a young lady. In four behind her were two applicants. One of them, a young man, probably of Arab origin, they harassed apparently. I noticed it immediately when I saw her expression.
He said "Why do not you answer me in German?" And she replied "Because you asked me in English." I think he had his hand on her back. She turned away and looked in my direction.
From the beginning, I stared at the young man in order to signal to him that I watch. As the train pulled away, hit the applicant with full force against the disc. He was probably angry that the woman had not let him. Several older men shouted that he should stop.
One of these men, who sat in the quad to the left of me was suddenly touched by a third asylum seekers at the top. He stroked his bald head to mock him. Such disrespect I've only rarely seen.
I was and am of the opinion that the third party did not belong to the other two. They spoke neither before nor after one another and were separated. He felt at ease only belong because of other asylum seekers was admonished - and not at all suited him.
As was the older gentleman in the bald head touched, he got up immediately. The applicant stood on the seats, walked over to the man and grabbed him by the neck. Everyone stood up immediately, many went in between. Since I had my cell phone in my hand, I was filming and stood just two meters away.
I was determined to intervene, if necessary. My heart was racing. When the men went between them, read from the attacker of the old gentleman and fell back into his four-seater. Now there were four applicants for asylum in front of us and made us angry stare and met two other gentlemen. I said that they should behave.
Besides and behind me were about ten to 15 people. The situation was under control.
The train arrived at the Central Station. I called that I call the police. The other shouted that they should get out and they did.
The rest of us went on and talked about the incident. People were very scared. "