It didn’t necessarily need to feature a bucket’s worth of blood to make it more punchy – even the outlandish cranial demolition done to Oberyn Martell had to get scaled back from what was planned – and it might have overshadowed the scene’s best element, which was obviously Sansa’s enjoyment of the bloody goings-on.
Krentz and the Image Engine team were responsible for all 72 of the deaths seen in Season 6, and he has a great explanation for how they put together shots of heads smashing into walls and similarly gory bits.
Ramsay’s death was by far one of the most understated in the series’ six seasons, taking place in shadows as thick as the dread settling between the sadistic bastard and his victim-no-more Sansa.