As for your REF02 Vref,
If REF02 short Vout to GND, then what is the output voltage action?
1) drop to GND directly soon
2) when over the some load for a while, and drop to GND
Otherwise another action?
Any time that any output is shorted to ground, the output voltage will immediately go to ground potential, or zero volts relative to that ground. The exception, of course, is when the "short" is not zero…