My guess is that she got tired and wanted to stop but they guy refused and then struggling ensued between them. He exerted too much force on her to subdue her and that caused her death.

My own question then goes, if she was dead, why keep screwing her? Its nothing to do with the burantashi cos he would have gotten away before the cops came in. Something fetish, spiritual or simply evil was involved.

At age 40 and a man's libido might be on the downward, that is a pure lie, how can you say a man of 40 libido is down when i use to see all those 60 yrs men doing it hard not to talk of a young man of 40 yrs...