Found this chart which aligns well with what I was saying about the different levels of the nervous system and how the different responses map to them:



It comes from here:

SOMATIC TRAUMA THERAPY

So looking at this the Feign response is probably close to what the author here calls Hypo Freeze - certainly for me this was my response to times when someone tried to strangle me, I went limp and played dead but I also felt dead inside and take myself to this place when I feel everything is falling apart - it's a highly dissociated state that actually protects me because I feel numb to everything in this state, I think it's also the most primitive state biologically

btw this is also useful when thinking about how to pace/balance therapeutic interventions and things like medication