If a hypersonic jet (Mach 10) were to experience sudden engine failure at high altitude what would happen? Would it continue travelling forward, slowly decelerating and descending, thereby giving the pilot chance to attempt a controlled engine restart? Or would the jet experience catastrophic Mach Buffet, drag divergence or Mach Tuck and go into a spin? If such a jet were to experience engine failure while travelling within the mesosphere rather than the stratosphere would this have any effect on the outcome? Thanks.