But the Qur'an does not give us this detail. Surah Al-Na's are supplications seeking the protection of Allah from all kinds of evil, including the evil of Magic. Experience shows that humans can be adversely effected by a magical spell performed on them. Such a spell has nothing to do with Islam or religion, in general.
Magical spells relate to spiritual sciences.
Experts in this field can effect our lives. This effect is psychological in nature. Because of its psychological nature, it can only effect people who have a weak psyche. People with true faith and unerring dependence on Allah are not effected by such spells. It is only our own lack of faith that makes us vulnerable to such spells.