Billy tried to find some similarities between the lifestyle of the elementalists and the points they obtained the power to control mana, but he didn't find any. After that, he dueled with some of them and asked at the same time. One learned when he was playing with food, the other while she was playing with other kids, when they were sleeping they suddenly woke up in a bed made of earth…
In the end, after a full day of duels and lessons, he didn't learn anything new. However, he still had a hypothesis, what if the elementalists get used to controlling mana after seeing other people do so for many years? While he was just an average dude in his previous life, he became quite adept at that after leaving with a tribe of spearmen for ten years. It seemed too simplistic, but it was the only thing that Billy concluded.
