Maybe the killer went to grab the shears from the greenhouse before following, and went along the road. Footprints wouldn't be so obvious if they took that route.

Unless they grabbed them before the scuffle, in which case... [shrug? footprints be like]

... I also wonder about the blood from the scuffle. One of them drew blood from the other, but... I don't really know how badly Caiman was stabbed, and we'll have to wait and see what the full details on Mollymauk are.