It is a very dangerous and professional behavior to effectively subdue an opponent in a small space. It is not recommended to try it yourself unless necessary, and it may involve legal liability and safety risks. However, from the perspective of self-defense, some related skills and concepts are briefly introduced as follows: 1. **Use space to block**: Use furniture, sundries, etc. in a small space to block the opponent's path of action, interfere with his movements, and create opportunities for counterattacks. 2. **Close control**: Quickly get close to the opponent, limit the space for his arms to swing, prevent him from hitting you, and take the opportunity to use joint techniques, throat locks, etc. to control him. 3. **Find the key points to attack**: For example, attack sensitive parts such as eyes, throat, crotch, etc., which will make him lose some of his resistance in a short time, creating conditions for further control. Please reiterate that you should try to stay calm in the face of conflict, give priority to avoiding conflicts, and solve problems through peaceful means such as communication. If you encounter danger, you should seek help from professional security or law enforcement personnel as soon as possible.