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: Two dogs play together and another runs after in a field. Sentence 2: The dogs are chasing a ball in the field.
Two dogs are running in a field.

Sentence 1: Brown dog with white marking on forehead coming down cement steps. Sentence 2: A brown dog is coming down with a stick.
A brown dog is coming down.

Sentence 1: A crowd of people watch a martial arts demonstration. Sentence 2: A bunch of people sitting at a stadium.

A bunch of people watch people compete.