One should note that - largely because of its ability to self-detonate - nitrous oxide has every now and then created unhappy surprises whose causes are difficult or impossible to explain. This may turn out to have been the case at Mojave. If in the end no cause for that incident is identifiable, Scaled should perhaps consider an alternative oxidizer for its hybrid; liquid oxygen (LOX) may be less convenient to transport and manage but doesn’t have nitrous’ particular unpredictabilities.