To begin with, it's less like something happening and more like the moment when the lines on a blueprint click together to form a coherent whole in one's head.
She is surrounded by a sphere of cogs, each one whirring along with its neighbor in perfect harmony, to perform some grand ineffable task.
She sees herself, dismantling a Tesla cannon before it can fire.
She sees the tools of horror smelted, leaving their despotic wielders helpless to inflict harm upon the innocent.
She sees toxic or tyrannic systems, in Germany and elsewhere, interrupted, disrupted, destroyed.
She is offered a choice.
She can have this power. Will she?