the beholder ability doesn't give them control of the unit at all, it only allows them to pre-select an action for the unit before confirming the ability then see it carried out (at least IIRC) so it works a bit like the selection in say the demonologist life ability, wherein you pick a unit to force to do an action, then you tell it who to attack, and that's all it can do.
the beholder therefore cannot do things like make your unit waste his abilities, that's why it works on celestial guards, they're not immune to abilities or anything they're just immune to status conditions.
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