I have read about these twins where one of them stayed on the Earth and the other traveled with a rocket. So I thought about the other case where a person stays on the trains station and the train is passing by with a near speed of light - if the guy in the train drops a ball on the table - it will fall for let say 1 sec and it will fall just vertically, while the guy one the station will see the ball falling at the same time but will fall let say a meter away.

So I thought - what if the guy on the train drops the ball outside the window - then what happens?