[Yukiko had been focused on battling the shadows but as her fight had brought her within earshot of the conversation, she caught snippets of the conversation. And the question that the stranger had asked Yu, in following everything he'd said before, coupled with Yu's reaction, was enough to trigger something in her, that part of her that reacted before thinking, that allowed her anger to take over if only for a short moment.
As a result, she stalks over and attempts to whack Minato with her fan]
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As a result, she stalks over and attempts to whack Minato with her fan]