private void executeDigg() {
   ShortPoint2D pos = movable.getPos();
   super.getGrid().changeHeightTowards(pos.x, pos.y, requester.getAverageHeight());
 }
 private boolean needsToChangeHeight(ShortPoint2D pos) {
   return super.getGrid().getHeightAt(pos) != requester.getAverageHeight();
 }