HW Quattro and Pixhawk; which one rules the throttle signal?

I've been using a HobbyWing Quattro 4-in-1 ESC all year for my test quad. It has worked very well, however reviewing the manual while installing another in a new copter, it states:

Throttle signal loss protection: The ESC will reduce the output power if the throttle signal

is lost for 1 second, further loss for 2 seconds will cause the output to be cut-off completely

I overlooked this. So I tested it without being connected to the FC. Sure enough, power was cut completely.

Having flown dozens of missions, some long distances but following in my truck, I had the dreaded "RSSI critical" warning many times, but can't say if the signal was actually lost. It's never crashed, but now I'm wondering if I just got lucky. 

So my question is, if the radio signal is lost, does Pixhawk prevent the Quattro from shutting off the motors? If not, as much as I like it, these ESC's are a crash waiting to happen.

Does anyone know?

When testing FS, the X8R is set up for "no pulses"; I turn the radio off and MP says "Land" or "RTL" (or it used to), so that works correctly I guess, but what if the radio is turned off while in the air? Will Pixhawk override the Quattro?

Thanks.

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