Witnessed a physical fight in First class local

Today i was travelling in churchgate fast local in first class. When the train halted at Andheri a man boarded the fc compartment. Another man already onboard rudely said to him- “Yeh first class hai chal nikal yahase”

The other man grabbed that mans collar and shouted “Pata hai ma******d”. The other man got scared and quietly went to other side and sat quietly for rest of the journey.