Ger,
I have seen it, but maybe before you were born. It was not a Hirsch, but a Reh Bock and the blade was a jagd knicker(?). The Hirschfanger(?) was used for this in historical times, when a crossbow was used, instead of 9.3x74R or 7x65R. The Saufeder was intended for Sauwild, but I guess one could be used on anything. When I hunted there, a pistol was legal for Fangschuss(9mm/38Spec/357, etc)and I suspect more would be used than any blade now. I see blaze orange in recent photos; when I was there, this would have been an insult to other hunters. "Times they are achanging".
BTW, I, myself have dispatched a whitetail with a knife.
Mike