Leon learned the skills to heal burns, but since it was at a low-level, he had to use it several times before he could get rid of all burns in his body. However, he felt really refreshed after doing so.
"Considering what you said, I can imagine that you don't know any Area of Effects spells," Lennart said.
"That's right… but how did you notice that?" Leon asked.
"Because you didn't use such type of skill against my friends and me," Lennart explained. "Nor did you, when you invaded Moscow. To learn an Area of Effect spell without a tome, you have to have pretty good control over your mana."
"Is that so?" Leon asked.
"Yes, since most of those spells last for a while, to learn them, you have to keep sending your mana to the phenomena you created," Lennart explained. "To learn the spell Freezing Mist, I have to create the mist that could freeze most things and keep it activated for ten seconds."