This could put them and everyone else at risk if they accidentally use magic without knowing how to control it.
Raymart and Alice have yet to learn about magic though. However, since they have dragon blood, once they see it performed, they may learn much more quickly by imitating it or relying on their instincts.
In one of Arabella's curious questions, Ferdinand had explained that since Primordial dragons like him and the generations that followed them mostly learned and survived through their instincts and gut feeling, it became ingrained among dragons even in their sense of mana and magic.
Thus, most dragons now learn magic quickly since it was already ingrained in their system from the efforts of the previous generations.
This was why Alwin had only shown Raymart and Alice a few spells such as conjuring non-harmful things like flowers.