Sentence 1: Jack closed a door on Dominic. 
 Sentence 3: Dominic jumped out of the corner and terrified him 
 Sentence 4:  That caused Jack to tackle Dominic and tickle him until he cried 
 Sentence 5:  Brotherly love is a funny thing! 
 Option 1: The door locked and Dominic couldn't get inside. 
 Option 2: Dominic waited, then snuck up on Jack.