Hibari thinks it’s about time someone told Kyouko and Haru a few things.
He remembered the point in his past, his old past he supposed he should say, when Kyouko had finally coaxed the truth out of her brother and Sawada; it had been the first time he’d thought the girl might have teeth after all. He remembered the impressive black eye and the hangdog expression that Sasagawa and Sawada had sported, respectively, afterwards; the bruise had faded sooner. He remembered the fierceness in Sawada’s eyes when he’d demanded Kyouya’s word that he would protect the younger Kyouko and Haru, when they came forward; only after that word was given had he, reluctantly, agreed to the whole plan.
Of course, in Kyouya’s opinion, the best way to protect someone was to sharpen their teeth.