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: These people are doing dangerous things. Sentence 2: These people are doing illegal things.
People doing dangerous things

Sentence 1: A man on a steep incline wearing a white shirt is working on a roof, with lots of debris all around. Sentence 2: A man is cleaning all the trash off a roof.
The man is doing work.

Sentence 1: A man climbs a rock wall. Sentence 2: The man is a professional athlete.

A man is climbing.