They don't behead people, or amputate hands, or stone adulterers just for the fun of it.
amputate the frostbitten toes of several men in his party.
We can measure his heart rhythms, take his blood pressure and even amputate a limb.
The surgeon should then wait until the "line of demarcation," linear ulceration, between the living and the dead part is evident,, and then, if the case permits, should amputate at a higher level..
In spreading gangrene, in which acute sepsis is present, and in which no line of demarcation forms, the best chance for the patient is promptly to amputate high up in sound tissues.