Sentence 1: Bob's friend wanted to comment on some of the house images he had. 
 Sentence 3: When he was done he sent them back to Bob 
 Sentence 4:  Bob was somewhat amused by his friend's snarky comments 
 Sentence 5:  He was less amused at all the things his friend had found wrong 
 Option 1: He used a program to highlight places on the images. 
 Option 2: Bob knew he would be rude, so he simply deleted the message without reading it.