[Aqua's expression and her harsh words caught Katsura so off-guard that he couldn't even anticipate the kick aimed at him, much less avoid being hit. That it had been aimed for one of his still healing injuries only made the resulting pain worse, along with Katsura's decision to not let Aqua even think that she had manage to hurt him.

Gintoki however would have been able to feel the pain, as well as Katsura's growing distress over the situation. Her words were undoubtedly resonating a little too much with him right now, given the similarities of their situation, Black Blood or not.]

Aqua-dono, even if it's true that everyone must leave sooner or later, that doesn't mean people are always going to disappoint you!