About TAWS warnings, I belive that TERRAIN AHEAD is not very informative, but PULL UP definitely mean not only that vector of a/c speed pointed in terrain, but that in the same time a/c speed and configuration is wrong for landing
Vector of a/c speed tends to point at terrain sometimes, it's sort of the point of "landing"!
A/C speed and configuration were essentially correct for landing.
The only "useful" warning the TAWS could give, in this approach type, would have been a "Sink Rate" type warning. It did trigger, but not audibly since it was overridden by the "Pull Up".
As I said before, I may be wrong. But it seems the TAWS behaved exactly as our EGPWS systems did when inadvertently flown to airfields not in the database.. and when not inhibited.