In other words lest say idle n1 was 55%
One would imagine for n1 at 70000feet in this example would be 101% maxed out
Clearly the engine is not idle.
The crical thing now would be the itt or egt etc temp as the flow of air to fuel ratio will be the limiting factor. To stop this exceeding the temp they will have to drop of fuel which would put the engine below min fuel and therefore flame out.