Sentence 1: I was walking home from work in a downpour. 
 Sentence 3: 2 men were holding up an old woman, trying to steal her purse 
 Sentence 4:  I rushed to help, and with the woman behind me, drove them both away 
 Sentence 5:  She thanked me kindly, though shaken, and I walked her home 
 Option 1: I heard shouting coming from a nearby alley, so I ran over. 
 Option 2: I heard barking coming from a nearby alley, so I ran over.