Sentence 1: George was walking past a row of parked bikes. 
 Sentence 3: This caused all of the bikes to go falling over 
 Sentence 4:  He looked around and saw that no one had seen 
 Sentence 5:  Quickly, he fled from the seen 
 Option 1: Suddenly, he bumped one of the back tires. 
 Option 2: He saw a man struggling to put the lock on, and stopped to help him.