"Because it is pouring outside and we are at the top of the mine, although it is pretty deep to be solely from the rain that just started. Let's check it out and see if I'm right. If it is brackish that would indicate old water from prior rains or a different source, if it is fresh and there is a hole in the ceiling that water enters in from then I would take that as evidence to support my theory."
Even in dangerous hobgoblin territory, Enthalus seems engaged with curiosities and intellectual theories.