A couple of months ago, while Arthur was training his water magic in the front yard, something came to his mind.
Manipulating water in his surroundings, producing water from thin air, and forming spells based on his command over the mana lent by the Spirits was something he has achieved through training and experimenting.
He could confidently change the course of water a few months ago when the flood hit the town, and regularly, during the dry season, he waters the crops to save the farmers from doing extra labor by bringing water from the well.
So, one of those days, he asked himself the question: can I really manipulate water from everywhere in my surroundings? Like, wherever it was stationed? Does it truly have no limits?
To satisfy his curiosity, he tried manipulating the underground water, to replenish a dry well. His motive was to see if the distance from the source, or any other factor could influence his manipulative capabilities.