Oh yes - natural and supernaturally simultaneously? I speak of
   uncertainty of the nature of inertia, that's all. Newton's
   original formulation had "innate resistive force" as part of the
   formulation - in short, "could be internal / could be external",
   but physicists have abandoned the potential of "innate",
   removing interesting possibilities.   It was a practical matter
   of course but it's gained 'force of law' as it were, over the
   centuries. In areas of uncertainty, I don't see any problem with
   a simultaneously naturalistic/supernatural formulation to be
   plausible because it's not provable either way just. The
   objective-assumption (that someday it will be) is an article of
   faith but fact be fact, we don't know certain things, which
   leaves the playing field tantalizingly open.