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 in a gray shirt seasons meat on a grill. Sentence 2: The man is cooking a steak.
A man is seasoning meat on a grill

Sentence 1: Two people, one wearing a checkered shirt, and one wearing a plain light colored shirt, are running on a balcony. Sentence 2: Two people are running on a balcony being chased by cops.

Two people are running