From article , by (pacplyer):

For example: the attitude control system when
the vehicle is out of the atmosphere is just compressed air! What
would happen if a little moisture froze up the attitude air valves?

That is the genious of the design. With the wings cocked, the reentry is
stable without attitude control jets at all. I suppose that if the wings
didn't cock, then the jets would have enough authority to control the
reentry. *Both* would have to fail to lose the vehicle.