In Polly's case, the killer cut her abdomen in a downward movement. To achieve this, his knife has to be dragged through areas of different density which may result in the knife getting stuck momentarily and then jump forward as soon as more force gets applied. This almost inevitably leads to a bit of blood spattering about so it seems very likely that some of it landed on the killers extremities and/or clothes.
He said that she was stabbed in the abdomen, and then the killer made a first cut upwards, which veered to her groin and over her (left ?) hip. He then made a second upwards cut to her breastbone.
It would make sense for the killer to cut away from himself to avoid blood spatter.
I,too, have often cut up dead animals ( I was a sheep farmer) and I can't
remember ever getting much blood on me, although granted, it was not in the dark.
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