When defending yourself or subduing an opponent in a confined space, safety and effectiveness are the most important considerations. Here are some tips and strategies: 1. **Keep calm**: First, try to stay calm so that you can assess the situation and respond more effectively. 2. **Use terrain**: Use obstacles or walls in the environment to restrict the opponent's movements while protecting yourself. 3. **Close-range strikes**: In a confined space, long-range attacks are not very practical, so close-range attack techniques such as elbow strikes and knee strikes can be used. 4. **Control joints**: Grabbing and controlling the opponent's joints, such as the wrist, elbow or knee, can effectively restrict their movements. 5. **Attack vital parts**: When necessary, attack the opponent's vital parts, such as the eyes, throat or groin, to quickly stop the attack. 6. **Stay stable**: Keep the center of gravity of the body stable so that it is not easy to lose balance when attacked. 7. **Voice deterrence**: Shouting loudly can deter the opponent and attract the attention of others around. 8. **Simple and direct**: In a confined space, avoid complex movements. Simple and direct strategies are often more effective. 9. **Learn self-defense**: Appropriate self-defense training, such as Brazilian Jiu-Jitsu (Krav Maga), Aikido, etc., can improve your ability to deal with threats in a small space. Most importantly, if conditions permit, you should give priority to retreating or hiding to avoid actual physical conflict. Any physical confrontation may be dangerous, so please be cautious when defending yourself.