It's fine if you want to explain the 'garrote' as a device in the hands of a skilled weaponologist. I like to think of the device used as a slipknot with a handle tied to the end for grip. Depending on your theory, it's either premeditation and skill or improvisation and desperation. Also, a garrote was originally used for execution. I didn't know that the garrote's traditional use was for torture. If the torturer were to use the garrote in this way, wouldn't this particular knot be a poor choice? This type of knot could lock into place and would be hard to control if you wanted to torture/slowly strangle someone.