First of all, in any case, it is illegal for Zheng to hurt people with a knife, and there is no problem for the police to control the shooting. If left unchecked, the three injured people may worry about their lives. Now the three injured people are out of danger, but the situation is not optimistic. Therefore, we must be wary of people who are grumpy or eccentric around us. If you have conflicts with them, you must remember not to have physical conflicts with them to avoid injury.
Secondly, judging from the interview with the reporter, at least one of Zheng and the three injured people with a knife is a friend, and the other two may not have personal relationships, but all four of them know each other, but all of a sudden, Zheng was also treated after being shot, so there is no more information yet. In addition, the police report must be objective and fair, and it is certainly impossible to report the results soon, so don't make rumors at will before the police report.
Finally, there have been many cases of stabbing people recently. Not long ago, a good-hearted man who persuaded people to pay the bill was stabbed to death. There are still cases of stabbing people in broad daylight, which also shows that many people can't control their temper and have a weak legal consciousness, otherwise they would never do such a bad thing.