He opened up about the controversial season in a new interview
The 'Black Mirror' co-creator says difficulties were to do with George RR Martin being a 'seat-of-the-pants writer'
Miguel Sapochnik also says he was strictly "visually policed" by showrunners
He was slightly gutted to be crushed by rubble so quickly
There was a subtle answer later in the episode
After deaths and dives into darkness last week, the pool of candidates is shrinking as the end approaches