I'm not sure if I understand well but I'll give you the rules to make it clearer :
When a line doesn't have any bamboo left it will explode. And the bamboos that get deleted are the one that the last ball touched. So if you move in between you can technicaly do some weird stuff. A circle need 3 balls in a row to validate your move, and it starts a 5 second timer each time a ball goes. If after 5 second an other ball didn't reach the counter reset. And since a ball spawns every 4 seconds it works 100% of the time if you don't change the path, but can be hard if you move as it goes.
Hope it helps you and thank you for playing!