I am not 100% sure.

The power is down.
The Feathertwo is making a tone when operating the motors (I think sound is coming from the ESC)
It moves forward and back but not turning when on the ground, but works properly when on stand.

I have 3 fuses all at moment under sized for testing and none are blowing. A battery fuse 30A, a ESC/motor fuse 30A and a lineac fuse 15A.

Very odd. I sent a PM to Rapid Rory

Two thoughts:
My shockingly bad soldering (the kill switch was getting very hot)
The RX is sending bad signals to the ESC