Go back upstairs and attempt to cross the well, only to have a cloud of bats
prevent Harker from going any further. Turn around and if you look along the
right side of the track, you'll find a lantern lying on the ground. Use the
lighter to light it and then pick it up. Head back towards the well, but
don't try to cross it just yet. Look down and to your left and you'll see a
puddle of fuel at the bottom of the well. Toss the lantern onto it and watch
the sequence as the ensuing inferno sears and smokes out the bats roosting
above the well.