Im not missing a point.
Malhart already disabled Cheryls power. There wasnt a need for Noel to do so.
Until now, where some idiots shot Malhart with black crystal.

But.. no we dont have any evidence that Malhart could remove powers.
All he did was specifically supress Cheryls. As well as make it harder to sense things.
It does not mean anything that Noel were able to do stuff inside of the field.

As for what Noel want? Quite likely to shut down Cheryls powers. Free his family. Free his adoptive dad.
Get out of this stupid empire?

And why the heck should Noel take the high road, with a cold blooded murderer who is directly promising to kill him?
For all we can see #1 is a rabbid animal and should be treated as such.