private boolean hasPairedExit(int row, int col, Direction dir) {
if (row < 0 || row >= this.nRows) return false;
if (col < 0 || col >= this.nCols) return false;
GameObject obj = this.getObjectFromCoords(row, col);
if (obj == null) return false;
Point startCoords = this.getStartCoords(row, col);
return obj.hasExitAt(row - startCoords.x, col - startCoords.y, dir.opposite());
}
