TASK DEFINITION: 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.
PROBLEM: Sentence 1: A man riding a brown horse poses in front of a mountain scene. Sentence 2: A man is on a horse in front of some mountains.

SOLUTION: A man is riding a polar bear.

PROBLEM: Sentence 1: A person is bundled up in cold weather gear near a snow-covered mountain. Sentence 2: The person is outdoors.

SOLUTION: The person is sleeping in a restaurant.

PROBLEM: Sentence 1: A female athlete attempts a vault over a pole while spectators take pictures. Sentence 2: A female athlete is vaulting.

SOLUTION:
A female is stretching before her event.