Langdon was given a 'phone by Ma'lakh at the offset. It has remained on his person from then. The battery without charge. The 'phone never used by Ma'lakh to simply locate where Langdon is at any given time. The CIA have Ma'lakh trapped in a car park - yet it is not sealed off - and he drives straight out. Not even an attempt to track, trace, stop the vehicle as it makes a getaway in the City.
Review of Melencolia I
