I would plunge the knife so deep into her gut.
Digging around the hot wetness with my probing digits and stuffing handfuls of snow inside.
Cutting deeper and deeper into her womb to jerk myself off as I fuck her cunt.
Her blood pools around my thighs and knees and she gurgles muffled cries through her stained cheeks.
Her last moments would be spent in shock and terror.
As I tell her with a calmness unfitting of the situation that she will feed the animals well I would slit her throat with her face in the frozen pond.
I wonder how many times I'd have to bash her head against the ice to break it and send her sinking away to the depths.

The red-stained snow angel we'd made would be covered with fresh snow overnight.