I don't see any MGF IYG (in your Glorantha's) limitation of the spell. I think that Praxian history argues rather strenuously against any pan-Praxian solidarity against the NLU's out there. (Anyhow, Zebra folk are Waha people.)
I ran into this problem in the very first RQ game I ran, the first Borderlands scenario, where the Morokanth were about to brainwipe an Agimor. I wasn't 100% sure that the Agimor were subject to the spell (the info available was kinda ambiguous, I thought at the time), but they had to be to make the scenario work. So I glossed over it.
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