Dear Epis,
You have to understand that the reason he wants mixed dancing, is not a disease it’s a symptom, you have to find out his disease why he came to this level to want mixed dancing,you have to know what triggered him to come so low, when you come to the doctor that you don’t feel well and you have fever and a rash and you have no appetite,the doctor wont prescribe a medication for everything separate, the doctor will find out whats causing all the symptoms and he will give you one medicine to cure all the symptoms, the same here you need to cure his disease and then all the symptoms will be cured Bezrat Hashem.