hesitated start on blown mustang

Well, the fuel rails probably pressurized at first, then as you released the clutch, the fuel in the rails dumped to the injectors, but then you stopped it.. so, the rails need to repressurize before they can dump fuel to the injectors again, which takes a second.

I would try to start it then release the clutch so it dies, then cycle the ignition a few times, then try to start it and see if that helps.. if not, your pump may be taking a crap.