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.

Example Input: Sentence 1: Children are competing in a potato sack race at an outdoor social gathering. Sentence 2: Children participate in a potato sack race.
Example Output: Children play baseball.

Example Input: Sentence 1: Individuals are building a house. Sentence 2: People are building a house.
Example Output: A construction crew is demolishing a house.

Example Input: Sentence 1: A cyclist in a midair jump. Sentence 2: A byciclist is in the air on his bike.
Example Output:
A cyclist has fallen off his bike.