The heat in the comm pipes sounds like an actual burning fire, which does narrow things down a little.<br/><br/>But just a little. It could be an everburning stone, a hearthstone from another manse, a round ball of jade, or a few other things. And there's two ways of getting it out. The quick, easy, and less sensible way would be to reach down from above and grab it.<br/><br/>It's less sensible since that won't take much time and, more importantly, involves grabbing something that's burning.<br/><br/>It'd be slower, but less painful to just try and dislodge it with the spear and try and lever it up.