The Haze was almost certainly caused by the cabin being depressurised after landing (from around -200ft landing elev). If there was any oil in there it would have really stank!!
Are you sure that the crew didnt just select idle reverse? This is quite common and it doesnt make hardly any noise. I am not sure where DME is???? but if it has a whopping long runway, this is prob the reason to select a slow rate of retard. Usually even with a massive runway, most operators want to get the aircraft stopped and on stand as quickly as possible, with as short a taxi as possible and longest brake cooling period. So when the braking action is good, I'd imagine this is what the crews will go for-when the braking action is poor, I certainly would do what this crew has done and take it very easy stopping the aircraft with a big runway.
Hope that helps
Mr L.