No self-respecting teacher hates questions they hate stupid questions, in this case, Kayden's wasn't one of them.
"In most cases, the spell will destabilize and break, only some elements can come together easily, for example, water and ice have a certain similarity to each other, but if you try something like water and fire you will just explode."
Kayden easily understood the issue of balance and thanked the woman with a bow following local customs, after which he began to try to make the mana be shaped using small rays.
In practically all of Kayden's attempts he failed, lightning was an unstable element, when it was launched the next spell had to come together quickly, even if a few milliseconds of delay were enough for the spell not to be stable.