I suspect that not only are there the well researched Fight/Flight mechanisms and now the newly researched freeze mechanisms; that there is also a fourth mechanism. All these mechanisms are based upon fear (perceived threat/harm) and the need for pain suppression, probably as a survival strategy.
Just as we have true +ves, false +ves, true-ves and false –ves, perhaps;
Fight and Flight is a true or false +ve based upon context.
Freeze would be a false +ve, if you are one of those goats that fall over (I forget the breed, but under stress, these goats muscles freeze and they then fall over); many species, with enough camouflage, use Freeze to their advantage, true +ve.
I’d like to offer a fourth alternative for you to consider; that of faith, from martyrdom belief mechanisms, to hero status freedom fighters.