Yet another track plot from ADS-B Exchange:
https://flight-data.adsbexchange.com...ate=2017-12-05
Looks like uncorrected pressure altitudes with less sampling than FR24 or WebTrax but consistent with the other sources.
They did get pretty slow on the pull up it seems. For a CFIT EGWPS warning on the A380 do you pull the nose up to the command bars which gives you stick shaker?