"As well as a couple hundred feet below the PAPI slope at point of impact. Red lights only."
Take a look at
Document 42 ATC 3 - Attachment 1 - BAA - ATC Airport Emergency Operating Procedures Letter of Agreement Filing Date December 16, 2013 4 page(s) of Image (PDF or TIFF) 0 Photos
Open it up and look at Figure 9b on page 47.
They popped out of the cloud base about the same time they were hearing "Sink Rate!" Less than 4 secs later the captain said he had the runway in sight but from about then onwards, the 4 reds of the PAPI were obscured by terrain. Precious little time to make sense of it.