Pessimistic assumption: Plans which depend on the use of partial Transfiguration, or Transfiguration of volumes small enough to complete at timescales smaller than that of mean free paths in air (order of 160 picoseconds?), to circumvent the limitation on Transfiguring air, will only qualify as valid if they contain an experimental test of the ability to Transfigure air, together with a backup plan which is among the best available in case it is not possible to Transfigure air.