Rear heel down vs rear heel up.

[Panzerfaust]

from The complete Boxer (1914)

the left foot pointing
directly in front of you, the right about ten to fifteen
inches (according to your height) behind it, at an angle
of forty-five degrees or so. The left foot should rest
entirely on the ground, the right heel should be very
slightly raised. In this way your weight is equally
distributed and balance maintained.

[Robinson]

Thanks PF.

For the most part 'both camps' have at some point the
heel raised. Whether slightly or a great deal. What I am
curious about is the severe raising of the heel, case in
point would say be Jerry Quarry.