Jerryck has magic 'accidents'

Because of that he never submitted to the authorities that regulate the use of magic spells. If they ever found out they would not only kill him, but likely also his wife, his sister, and her four children.
Being the King of Brend's Court Magician makes it difficult to keep a low profile. Even more so when an unfamiliar magician unleashes hostile spells on the kingdom. Searching for that enemy will take him away from the very people he seeks to protect. Leaving the search to others will only allow more destruction.
Come read Spell Caster, the magical companion book to Portal Traveler and see the world from a completely different perspective.