Someone or something is digging the dirt out from under Jacob; or all the sand is going down the drain, and he is heading in that direction too. The great stage of this place has moving floors, 7 types of hydraulic, radio-controlled scene elevators, and seats for an audience of ten (or a hundred, if you put ten per seat, or ten thousand, if you use a thousand instead of ten... since the kind of person who comes to this sort of place is usually transparent and able to be in two places at once, it isn't that difficult to fit in the crowds of paying customers).