In this task, you're given a pair of sentences, sentence 1 and sentence 2, that neither agree with nor contradict each other. Your job is to alter sentence 2 so that the pair clearly 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: A man holding a sign and a man playing a guitar are speaking in front of a crowd. Sentence 2: The man is performing.
A man is holding a sign.

Sentence 1: Men yell into a microphone. Sentence 2: A person is shouting at the audience.
A person is shouting through a microphone.

Sentence 1: A boy riding a Thomas the Tank Engine scooter and a girl riding a pink scooter are on the sidewalk. Sentence 2: A boy and girl on scooters are racing side by side down a vacant sidewalk.

A boy and a girl ride their scooters