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: Four men are rollerskating in a line, with the last three holding onto the hips of the man ahead of them. Sentence 2: Four men are forming a congo line.
A group of guys carrying surfboards.

Sentence 1: A person in a dark outfit is walking down a stairwell which contains a shadow of an object. Sentence 2: Wearing dark clothes, the person walked down the stairs.
The man ran up the stairs, all the while not knowing whom he was chasing, although floodlights brightly lighted the stairwell.

Sentence 1: Man in a blue shirt bowls. Sentence 2: a man is bowling

a man is dancing in a blue shirt