Waterspout is the first of Amaterasu's "situational" powers, needing an external source of water. When the brush is over water, it emits blue Holy Smoke. By placing the brush over a source of water and drawing a line from it, Amaterasu can extinguish flaming treasure chests and neutralize demons of the fire element.
She can also draw a vertical line upward from a bubbling spring to erupt an elevator-like geyser. The geyser effect can also be produced from bubbling lava pools, although Amaterasu will need to equip the Fire Tablet to survive contact with the lava.