1. Stay calm: Although this situation may shock and trouble you, stay calm. Don't panic too much, lest you bring more pressure to your friends.
2. Confirm the situation: Make sure that your friend is willing to self-harm, not threatened or forced by anything. If the situation is urgent, you can seek professional help, such as a psychologist or a local crisis intervention hotline.
3. Talk: Talk frankly with friends and express your worries. Ask them if they have any self-harm behavior, and ask them if they have any emotional or psychological troubles.
4. Provide support: Encourage your friends to seek professional help, such as psychological counseling or psychotherapy. They may need support and encouragement to overcome psychological challenges.
5. Avoid judging: No matter what your friends are, avoid judging or criticizing them. They may feel very vulnerable and helpless and need your understanding and support.
6. Ask for help: If you feel unable to cope with this situation, you can ask for professional help. You can contact mental health experts, doctors or local crisis intervention hotline for more advice and support.
Most importantly, always care and support your friends. Provide emotional support and encourage them to seek professional help.