Same as #12, it is your fault because the NWFB Route 798 Stop at Sha Tin Station is alighting station.
This means that all Route 798 buses can only discharge passengers, but nobody can aboard the bus at this stop to Fo Tan.
Therefore, it is true that you cannot take NWFB Route 798 at Sha Tin Station.
Stop aboarding NWFB Route 798 at Sha Tin Station!
So, this is not the fault of the NWFB captain, but this is your fault.