Sometimes the popular history books skip over the nitty gritty details. There are other ways to, uhm, 'access' the intestines when they 'drew and quartered.' Look up how a hunter dresses and guts a deer to keep the meat from being spoiled by the contents of the gut. Bass Pro sells a special gadget to make it easier.
Now, transfer that to some "traitor" to the crown, and don't shoot the guy, first.
To call it cruel and unusual doesn't BEGIN to describe it.
Sometimes there are things you wish you could unlearn.
Don't need to look it up - I've field dressed my share of deer.
The secret is a short clasp knife and dental floss. Seriously.