G'mornin all (tho there may be some overseas G'evening WS viewers).
Apparently a video of the crime scene exists.
I'm not sure if it was video'd by news crews or if it was video footage they obtained via LE.
It's obvious it's a video showing parts of the evidence before it was removed from the crime scene. This is part of Channel 10 coverage of Bill's murder, which is shown on the following YouTube link.
The snippet of video footage starts at approx the 1:50 mark in the YouTube video. It shows a small portion of the knife and handle. The knife is partially embedded into the snow, upside-down (sharp blade edge facing upwards), with the knife being nearly horizontal (but with upward angle towards the handle end). At the handle there appears to be a few inches of clearance between the snow and handle end, which gradually tapers to no clearance between snow/handle at the handle to blade junction point.
I don't have a similar knife on hand at the moment, for a "probability test", but I find the knife blades straight vertical orientation to be quite unusual. Typically if a knife of this type were to fall onto the snow, it is highly unlikely it would do so with the "flat of the blade" in a near perfect vertical position. It can happen, but very rarely.
Furthermore, the clearance between the snow and handle is such that it is not beyond reason that this would be virtually the same clearance if someone was to have the knife grasped by the handle, then swing it downward, to intentionally embed it in the snow.
I'm not saying that is what happened, but these two "peculiarities/coincidences" do cause one to question this very unusual position.
Again, just an "oddity" and by no means actual proof either way.
My point is... the unusual position suggests the "possibility" of the knife *intentionally* being left at the scene.
YouTube Video at Comeans Crime Scene
Screenshot/Freeze-frame of knife at scene:
Screenshot/Freeze-frame of beer bottle at scene: