The German pair, Hase and Volodin, do FoDs.
Thanks, I was pretty sure it was them, but didn't have the time to check back and see
Can you elaborate on what makes the FO death spiral so difficult?
I'm not sure if I can explain it in words. If you're on that deep an outside edge in a death spiral, you have to keep your body's balance centre tucked together more than on an inside edge, closer to over your foot. Hence the usual backbend arch in the BO, as opposed to the flat-out position of the inside death spirals. The slightest bump or rut in the ice will make you rock a bit forwards or backwards on the blade and you have to shift your balance back to the exact spot, which for me is just a shade back of the ball of the foot, in order to keep the edge pressed into the ice. The BO is more forgiving of that shift of balance. If you're slightly too far forward on the blade on a BO, you'll just scrape the bottom pick on the ice and for a fraction of a second slow your run. But touch that pick to the ice while on a FO edge and you're going to trip on it, double yourself up and land on your knee, probably twist the ankle at the same time, and get your arm wrenched out of the shoulder socket because your partner keeps pivoting but you've abruptly stopped. OK, that's the worst case scenario, but at best your position will buckle and the whole thing comes apart. Get your weight too far back on the blade in the FO position, and your blade could shoot out forwards from under you and you'll go splat, while your partner hauls you around quite inelegantly until he manages to stop his pivot and help you up.
It's possible to do the BO in a straight flat position like the inside spirals, in fact that was the style when I was learning them. I have an old newspaper clipping showing my partner and me doing a BO death spiral where I'm almost lying flat on the ice, with no backbend. It doesn't transfer clearly to the computer screen, though, and I avoid showing it to people because it was before I got braces and my upside-down smile looks like Bucky Beaver Goes Skating

. I doubt if the FO one could be done in that position, though. Even Ludmila Protopopov didn't do it like that.