if the shovel was not there when you descended the deck and made your nocturnal visit to inspect things down by the worker 's campers , and the thing was not present when moments later i stood practically on top of it , yet it was surely in its present placement by the time that you returned from your inspection walk , it can only be assumed that whoever moved the shovel there did so in the span of only a few brief minutes between my being on the deck and your returning to it .