In this task, you're given a pair of sentences, sentence 1 and sentence 2, that agree with each other. Your job is to alter sentence 2 so that the pair contradict each other. Generated sentences must be short, with less than 15 words. New information can be introduced. Avoid using pronouns to confuse the subject of the sentence.

Sentence 1: Some people are standing outside at a sidewalk book sale. Sentence 2: People browse a sidewalk book sale.
A bookstore is on fire.

Sentence 1: A woman in a green shirt running a race. Sentence 2: A woman a shirt, that's green, is running a race.
There is a skydiver free falling on a sunny afternoon.

Sentence 1: A man sits on steps in the shadows. Sentence 2: The picture contains a guy.

The man is jumping.