The situation at hand was exactly why she had Margaret use "Abundance."
Margaret's "Abundance," a conscious inebriation and an advanced form of fervor, possessed the ability for refined control over the liquid magic power in a cup, akin to mixing a cocktail.
By infusing various emotions into the cup, Margaret was able to detach from her own emotional state and easily customize the effects of the magic power within it.
She could combine healing and protective effects, concocting the most potent positive outcomes similar to brewing potions; or she might layer various offensive effects like flames and lightning to create even more vicious attacks.
What's more, this "mixing" was not limited to her own cup.
Utilizing her own natural oddity, Asou Haruka was able to project everyone's true nature into a cocktail, seizing the opportunity to control the contents of others' cups.
