It is recommended that you be hospitalized, apply for injury identification at the same time, and get the injury report before you have the right to further treatment. Those who have reached the degree of minor injury or above meet the conditions for filing a criminal case for intentional injury, and the criminal responsibility of the other party may be investigated. If there are no minor injuries, or only minor injuries, it can only be a public security case. I analyze that public security organs should file a case for public security, not criminal cases. Filing a case for public security can only be punished in accordance with the Law on Public Security Administration Punishment, which is nothing more than detention or fine, and will be punished according to your injury. If you are not injured, then it is estimated that you will mediate and apologize according to the fight!
Whether the other party admits or denies it, or identifies you as hitting him, it will not affect the police investigation. The police won't believe one side's story, including yours, and won't believe the other side's excuse. The whole case should have a complete chain of evidence, including victim statement, criminal confession, witness testimony, on-site inspection, surveillance video and so on. Finally objectively restore the facts of this case. As for the released person you mentioned, if you are sure that the other party did it, it is very likely that the other party has been released on bail pending trial. Instead of not holding him accountable.
Nowadays, many places not only have video surveillance, but also have audio functions. It's best if there is monitoring at the scene. Even if there is no monitoring at the scene, the main road sections that the three suspects may pass through are likely to be monitored by video and audio, which is of great benefit to finding the evidence of the case. Conviction and sentencing of people's courts are based on facts and laws, and both are based on evidence, so the key at present is to collect, fix and enrich evidence, because evidence adjudication is the lifeline of people's courts and the key to effectively crack down on illegal and criminal acts.