I don't really know what you're asking of us here. When it comes to managing where Nikki is and being attacked I can only do so much, my last reactions have been "Evade/ Distract and then evade" with no variation because I can do naught else. Aethor is high in the sky, nimble as can be so even if the beast somehow managed to sweep the beam around after hitting Ishmael, with Aethors speed which is double volcanions at base, There's no way he's hitting Aethor but neither can aethor hit volcanion with even a thunder wave due to ishmael.
So what do I do but recycle the phrase "Nikki scrambled out of the way"?