Farewell to the mine. For now.
Your party, with the help of the miners who were in tow, collect the bodies of Hilik and Ren, as well as the wounded Ham-Fist. As you turn to go, though, you hear a squealing and scraping noise, then a flapping noise, like a hundred maids beating out rugs at the same time. You start for your weapons and turn toward the source of the noise, the crack in the wall, only to have to throw your hands over you face and duck to avoid the thousands of bats that explode out of the crack and bowl over the party, screeching and flapping madly.
There are several moments of confusion and miners flailing around or falling to the ground, and then, with one final bat fluttering out and down the passage the way you are going, the bats are all gone.
You then hear an echoey, far-away moan come from the crack in the wall. Mist detects evil, but finds none within range. After a few tense moments of hands on hilts, the moaning drops an octave and seems to move further away. Eventually, it has died down enough that you turn your backs on it and head back towards the surface.