The flying hand

One day a man call Xin went to school. Went he come back he sleep he wake up at 3:00am he look out of the window he saw a hand flying past the window.Next day he went  to school he ask his friend about the hand flying past the window  but his friend see not thing.100 day after that a man call Oxt make a time machine then Xin went to look at the time machine then he went inside the machine it take him to his house 100 day ago  then he got in black color but his hand did gotin black then he run past the window.