[Ol' Dan Tucker]

Plane went straight down in an out of control flat spin “death spiral”.

A flat spin is not a death spiral. Two different beasties.

[central_va]

How To Recover From a Flat Spin
The FAA teaches the acronym “PARE” to help pilots remember how to recover from a spin and spin recovery technique.

P – Power to idle
A – Ailerons neutral (control yoke centered)
R – Rudder opposite turn
E – Elevator forward

[Bonemaker]

It was....in this case.