It wasn't a tantrum! It was righteous anger at having discovered that she'd clearly been set up to fail. Because why else had Dean deliberately chosen a car a hundred times harder than he'd had to? And given her terrible instructions?

She finally stopped laying on the horn and turned to Prompto to say--something. And took in his face as all the color drained from hers, save for two spots of red high up in her cheeks. The purple in her eyes blazed before she turned back to the steering wheel and took a loooong moment to debate something internally.

And then, in a voice that was light and airy and smooth and oh-so-recognizeable to Ignis, she said, "You said to shift into forward then? Of course."