Justifiable defense: It is a method of causing certain damage to the actor who is committing unlawful infringement to prevent the public interest, the personal and other rights of others or others from being violated. Based on this judgment, which of the following acts is not a legitimate defense? ['At the bazaar, Zhang San and Li Si clash due to trivia. Zhang San used his arms to beat Li Si, and Li Si accidentally injured Zhang San.', "Li Ming came home from work and saw a thief stealing a bicycle from a neighbor's house. The thief wanted to run away, and Li Ming accidentally injured him with a scuffle.", "A young woman walking on the road late at night suffered violence from three young men and caused multiple injuries to her. The woman was hit with a fruit knife carried by her to poke the young man's carotid artery, causing her to lose too much blood and die.", 'A thief entered the house to steal and was found by the owner. The owner of the house immediately picked up a stick and other equipment to hit the thief. After the thief returned his hand, he accidentally beat the host seriously.']