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.

Sentence 1: A man gets ready to throw a stick for his waiting dog. Sentence 2: The man is outdoors with his dog.
A man is playing with a cat.

Sentence 1: A football player in purple is running the ball while another in white attempts to tackle him. Sentence 2: A football player in white tries to tackle a player in purple.
A girl is sitting on her porch.

Sentence 1: A free runner is jumping a rail. Sentence 2: A parkour runner springs off a rail.

The runner is stopped and giving directions to a couple at the park.