The use of the radio altimeter is not permitted during a non-precision approach
Like going below minimum, attempting to land way, way below aircraft minimas, not respecting FM and many other things. This is all I can say.
There was a "go around" from the II pilot when they were at 80 m. PIC continued the descent.
"Tunnel" vision. Landing and only landing. I think, it's now up to the shrink to say why.
Reminds a little bit the 2006 Sochi A320 crash
(
http://www.bea-fr.org/docspa/2006/ek...ek-9060502.pdf)
Arrakis