Or maybe because Sasquatches are tougher than your average beings, we've also seen River Shoulders take some fearsome punishments as well and survive.
Still mortal though, and anything mortal crushed by a solid ice block the size of a small building isn't going to survive unless they are able to somehow protect themselves. That much mass would be too much energy to divert via a shield, even for the Genoskwa with Ursiel I suspect. It would have kept pursuing Dresden otherwise. Harry was quite sure the old "open up a Way" trick wasn't possible where he was, particularly by anyone but him. He could be wrong, but if so why did they use him to get into the Underworld? Perhaps the Genoskwa turned itself into a liquid or gas...but that seems less likely given the requirements, and either form would struggle to maintain it's state of matter in such cold conditions.
The toughness of the being only matters if it's supernatural entirely. It's part mortal, and the physical mass has to go somewhere. His only other option is to dig into the ground beneath him, which again seems unlikely based on the speed and surprise of the attack and of the "ground" he would have to dig into.
The most likely scenario is a some sort of weird healing, or teleport. And it would have to be far enough that the Genoskwa would give up pursuit of Harry (if it were the teleport) and slow enough that immediate pursuit wasn't an option (if it were the healing factor).
River Shoulders and the Genoskwa are very tough beings, but I don't see how either of them could survive the impact of that much mass without magical assistance beyond their normal means.
With the exception of Nicodemus the Nicklehead's aren't that hard to kill. Ursiel dies the first time in Blood Rites. Separate the head from the body and they die. Destroy the head and they die. And so on. And he stole the idea from the Highlander, whose writer stole it from someone else.
But if Butcher wants to raise him from the dead all it takes is a word processor and the desire. At this rate I expect a party with all the quasi dead people of the Dresden Files in attendance.
It took three Knights last time to kill Ursiel's host. As far as I am aware, no Angel has died yet, Fallen or otherwise.
The idea of the head being the optimal target to ensure death is as old as humans. Older than any tale.
But I don't know about them being easy to kill either. In any case, clearly the Genoskwa survived somehow, and as far as I am aware they are not invulnerable or have rapid healing. So presumably his Fallen helped him survive, however it was done. The real question isn't how the trick was done, but whether the Genoskwa is still paired with Ursiel (assuming it isn't the Genoskwa from another universe, as per your theory), and when the Genoskwa will next show up.
Remember Tessa in small favor? She got a killing blow but just fell apart in many insects and they recombined again. Something like that would work.
Precisely what I said, glad someone else gets it.
HHSSW,
I was about to say Asher didn’t know how to do that… but then… Lasciel could remedy that quite rapidly.
I don't see Hannah Ascher surviving as she was so new at the Denarian angle. But then again, I didn't think the Genoskwa survived and here we are. Anything's possible I guess.