Used by the routines at MOVE_MUMMY, MOVE_DRACULA, MOVE_FRANKENSTEIN and MOVE_DEVIL.

What touching one of the four big hunters costs -- the mummy, Dracula, Frankenstein's monster and the devil call it on every pass they touch the player. Both penalties share the tail: store the new level, redraw the indicator, and on underflow die instead. As with LOSE_FOOD_SIXTEEN, a result of exactly zero is stored and the player lives, until the next drain wraps it to 255.