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.

Example Input: Sentence 1: A large white dog growling at a large black dog. Sentence 2: A white dog is retaliating at a black dog's growl.
Example Output: Two dogs are interacting with each other.

Example Input: Sentence 1: Man with a camouflage hat is throwing knives at a target. Sentence 2: an army colonel is throwing knives.
Example Output: a man is throwing knives

Example Input: Sentence 1: A boy in a plaid shirt blowing bubbles with a yellow bubble wand. Sentence 2: A child is blowing bubbles with a friend.
Example Output:
A boy is blowing bubbles.