1. Stay calm: stay calm and rational, and don't provoke the other party or make excessive behavior.
2. Ask for help: Ask people around you for help immediately and let them know that an attack is taking place. You can seek the help of nearby security guards, police or other public security personnel.
3. Stay away from the dangerous area: try to stay away from the attacker and move to a safe place to avoid being exposed to the attack.
4. Protect yourself: Find shelter, such as trees and walls, to protect yourself from attacks.
5. Contact the police: Call the emergency number of the local police in time, report the attack to them, and provide detailed information and on-site description. So, when you were dancing in the square dance by the river, you met a slingshot attack. You can take the above measures to protect yourself and others.