private void placeIntruder(Intruder i) {
		Space s = grid[i.getPosX()][i.getPosY()];
		if (s.getObject() instanceof Wall) {
			System.out.println("Cannot place intruder inside of a wall.");
		} else if (s.isMonitored()) {
			soundAlarm(i.getPosX(), i.getPosY());
		} else {
			System.out.println("Intruder is hidden.");
		}
	}