Brian, I think most here understand the regulations concerning a pressurized aircraft, no one will debate that point, 10,000 ft is where we descend to when the cabin depressurizes, yes we must also carry fuel for this worst case scenario, but going to 10,000 ft. immediately after the loss of crew O2 would not be my immediate action unless ample diversionary airports are available, is this an FAR violation, don't think so.