Two things for speculators and non professional air crew. It is a legal requirement to be satisfied that you have landing performance assured, that should take into account runway contamination. Secondly and with many hours on the B737-800 (I am sorry to have to state that but with all the prune ‘expertise’ I need to prevent incoming) I can say that assuming the first part is assured then you land it within the touchdown zone and within Vapp speed parameters and hopefully near the centreline then the aircraft will perform as advertised. What I will add and should be taken into account is that runways in monsoon conditions common on the sub Continent are not just ‘wet’ as would normally be the case in Europe but are actually flooded therefore contaminated.This should be familiar territory for an Indian crew. Anyway, sorry for the lost lives, not good.