Is it permissible to treat sorcery with a ransom (a black sheep) by claiming to deal with angels?

It is not permissible to treat magic by slaughtering animals, whether the slaughtered animal is a black sheep or otherwise. What the healer claims about dealing with angels is a lie and a fabrication, for he is an imposter who deals with devils, and slaughtering for them is polytheism with Allah. Allah has forbidden seeking healing through polytheism, by scholarly consensus. The questioner should resort to Allah through supplication and fortify himself with legitimate ruqyah (definition) and adhkar established from the Prophet, peace and blessings of Allah be upon him, or seek assistance from a righteous raqi who recites from the Book of Allah and the Sunnah (definition).