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 young man sits with his elbows on his legs while he reads a book. Sentence 2: A teenager is flipping through a book in the library.
A book reader is engrossed in his book.

Sentence 1: A man with dreadlocks, wearing a mask and a tribal costume, dancing on a street. Sentence 2: A man is performing for tips.
A man is dancing.

Sentence 1: A man squatting in the foreground of a photograph while taking a photograph of his own of a man doing a skateboarding kick flip in midair above a short flight of stairs outdoors. Sentence 2: A male skateboarder performs tricks outdoors for professional photographers.

A man photographs a skateboarder doing tricks.