In Braveheart, Gibson’s face is shown contorted in pain, but whatever happens below the waist is not shown on film. There is a shot of several knives on a table and another one of the executioner ripping off Gibson’s shirt with a bladed weapon, but the viewer never sees how they are used.
https://www.ranker.com/list/true-story-of-william-wallace-execution/nicky-benson

