When I was a lad, Mothers always wanted to make sure their kids wore clean underwear in case they were involved in an accident. Sally, if that saw reaches you, clean undies will be the least of your worries.
I hope for a reprieve for her too. I like to think the saw incorporates SawStop patented technology. This relies on the saw detecting the change in electric conductivity on the blade when it encounters skin. The blade stops in microseconds, and the woman will survive without so much as a scratch.(She may feel a bit of a draft where her panties have been cut open.) If she feels anything else at all, it is the warmth of the saw blade and whatever vibrations are sent shuddering through her body as the saw approaches.
Of course, the woman does not have to know that the saw will stop less than a hair's breadth from her....womanhood. A slow approach will give her time to think about and enough adrenaline will be pumping through her body that she will be eager to find some way to dissipate it. I can think of some ways to do that. And she won't have to be unclamped from her predicament.
The fantasy of being helplessly restrained in the path of an advancing buzzsaw is a very powerful image, and it seems to stir quite a few enjoyable feelings, not least erotic. In reality of course, it would be a totally horrific prospect to be faced with from a victim's perspective, so I guess that's why it works so well as a fantasy.
Anyway, I like your take on the situation and the teasing idea of your 'Saw Stop' technology.
The idea of being slowly and painfully dissected by a powerful circular saw (or indeed a laser) is pretty well too horrific to imagine, so a reprieved woman would most likely be very receptive to the ulterior motives you have in mind.
Yes, going through with dissection is not really erotic to me, even as fantasy. Still, there is something about the slow approach of something menacing directed at that part of a woman's body that seems to be a source of fascination to the dastardly-villanous part of the male mind. It must be the male subconscious mind's representation of what the male instinct REALLY wants to do to a woman down there. So this sort of peril is not something to be construed literally. It is figurative, a metaphor.
Yes, I can imagine the attraction it might have from the male perspective you describe, and using powerful machinery as an extension of (male) power and dominance, is delightfully imaginative.
Of course, in such a potentially lethal situation as the artwork above suggests, she'd have no idea of the villain's true motives (or if there was 'saw stop' technology involved). Which makes it all the more wicked.. and erotic!