and I do think that if the reverser deploys the throttle goes to idle, it is the reverser throttle/lever that would throttle the engine up once in reverse.
It's been a while since i flew the maddog, but from memory it was possible to deploy the buckets at
mlg touchdown at
ground idle , and when all wheels at ground spool them up in reverse.
So if the air/ground logic works as it should ground idle is all you will get if a TR should deploy on departure without weight on wheels.