We were waiting at Amsterdam Central at 7 in the mourning when all of a sudden, this very short man comes running behind this giant of a man and jumps on him, grabs his neck in a choke and brings him down. Then he starts pounding him in the face. All the time I was not sure if this was some sort of drunken madness, a violent joke or if it was a serious attempt at harm. The giant kept trying to protect his face until a rail conductor and police officers came to get this short man off the giant. The giant then stands up. Guy is easily 7' tall, towers over everyone and is almost twice the height of the short man. He says, "I don't know this man, I have no idea who he is", then he adjusts his glasses and straightens his hair and grabs his bag and leaves visibly unharmed but clearly distraught. Short man is escorted away by police without resistance.