Perhaps it might help if the relation between power, fuel flow and torque is understood.
Power is torque multiplied by rotor RPM times an arbitrary constant (the constant differs from helicopter to helicopter).
And fuel flow is directly related to power.
The other thing to consider is that torque is really the measure of drag on the rotor blades.
So if power / fuel flow is constant due to a fuel control preventing the fuel flow from increasing, and the collective is raised to increase the pitch on the rotor blades (and hence increase the torque), the rotor RPM will decrease.
The Bell 212 has a torque limiter that will reduce fuel flow whenever the torque is above the value set by the limiter. You can decide for yourself if this is a good idea or not. I think the UK versions had some minor change to the fuel control to make the torque limiter do something different.
Hope that helps to obfuscate the confusion.