The principle is this, because your balloon is smooth and inflated, and the tail end is knotted to form a pattern, which is supported by the inflated balloon.
Moreover, the friction of that grain is very large, and the force generated by its deformation, you can't automatically wrap those circles back after a few more turns.
Then as long as you don't step on it or twist it, you'll be fine!
Press 1 cm under the mouthpiece with the index finger, thumb and middle finger of the left hand at the same time, and then pull the uninflated part of 1 cm with the right hand, preferably more than 8 cm.
Pull the mouthpiece end with your right hand and bypass the middle finger and forefinger from outside to inside.
At this time, open your middle finger. At this time, the middle finger needs some strength.
The right hand will bypass the gap formed between the index finger and the middle finger, and grasp the mouthpiece after winding.
Pull out the middle finger and you will find that the knot has been tied.