F1 Restart

So how did the halo save his life exactly?

If the Halo was not there it would have been his helmet that smashed into the barrier when the car pierced the barrier and broke in two. The last F1 driver whose helmet took the full force of a collision was the late Jules Bianchi.
 
I'm having a hard time understanding how this happened (Russell to Merc this weekend).
He is Williams' best chance to score any points this year, given the nature of the Sakir circuit layout.
So why would Williams agree to release him? It only makes sense if Merc have paid a shedload of money for it.
But Merc have nothing left to achieve this season, so why would they do that?
The only party who will gain from this is Russell himself. How did he swing it?
 
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