Thank you for your reply.
We attached strings and weights to our programming drone according to the instructions of Japanese technical committee at the Japan open.It will only fly for 10 seconds and fly very low during our performance. And in emergency, it is planned to fall by one click. We took off it many times in Japan open, there was no problem. The technical committee of Japan know well so please ask them details if you need. There are photos and videos, please request it if necessary. Thank you for your cooperation.