Sentence 1: My father went back to use the bathroom. 
 Sentence 3: I ran back to see what happened 
 Sentence 4:  He had fell and hit his head 
 Sentence 5:  He died five days later from it 
 Option 1: I heard a loud bang just after he left the room. 
 Option 2: He heard a lound bang after he left the room.