Is it in line with national laws to distort the facts and close the case hastily and sentence people to detention?

If your friend is injured by the other party because of pulling the frame, it can't be minor or serious after identification. The actor has violated the provisions of Article 43 of the Law on Public Security Administration Punishment and is suspected of beating others. He should bear the administrative and civil liability for public security compensation according to law.

And your friend kicked the other person's shutter door after being beaten, and his behavior also violated the provisions of Article 49 of the Law on Public Security Administration Punishment. Anyone suspected of intentionally damaging property shall bear public security management and civil liability for compensation according to law.

For such minor cases, the public security organs should mediate according to Article 9 of the Law on Public Security Administration Punishment. If mediation fails, the perpetrators and your friends should be punished according to law. However, at the time of punishment, human rights are greater than property rights, and those who hit people should also be given detention punishment.

Now, your friend can apply for reconsideration to the public security organ at a higher level or the people's government at the same level within two months. If you refuse to accept the reconsideration, you can also bring an administrative lawsuit to the people's court within three months.

Regarding civil compensation, a lawsuit can be brought to the people's court according to law.