Whip was tied by two belts and beaten a bit, but then extricated himself from one belt and crawled to India and tried to grapple with her, upon which Uncle Charley loops the discarded belt around Whip's neck, braces his back, and proceeds to stretch Whip's neck until it gives.
It has been a while, if I'm wrong someone please jump in and correct the record.
"The doubt for me is that having been overpowered and trussed up by Uncle Charlie, would Whip have still tried to rape India?" - Vikki-Verki
I didn't get the impression that Whip was trying to rape India at that point, I think he was just trying to hurt her. I don't think for one moment he thought his life was in any danger. Although at that point in the film I was slightly distracted ... by ... how dirty India's feet were in the shower. Yeah, I was totally distracted by India's ... erm ... feet.