If it is as you say, then no one is responsible, because it was an accident.
To investigate the responsibility of the team leader, we must point out the fault of the team leader, otherwise there is no responsibility to investigate.
When not dancing, you can enjoy the cool under the big tree. If something goes wrong, you can find fault in the egg and reduce the loss. This is very chilling for those who are enthusiastic about organizing everyone's entertainment and exercise!