Firstly Southcoast I ain't your boy....and secondly have you ever operated into Kin? If you have then you'll realise that you receive no information from the ATC as to the state of the runway.Since the aircraft departed JHB in the evening it would no doubt have landed in Kin in the dark. Putting all of this together again I assume that the crew were unaware of how wet the runway in fact was. If you are a seasoned traveller to Kinshasa then correct me otherwise. But this ain't Europe and once you're north of SA you receive absolutely no info on the state and condition of runways/airports!!!!!!:
The Hydro 74 prang springs to mind...................!!!!!