Kohaku: "I'm so afraid we might not have much time together...Saber, I told you. I want to help you. Rin says that Servants are similar to their Masters. I can feel things now. Happiness and sadness. I don't feel regret for any particular action; but I do feel a sense of guilt. I wish I could be someone else, I wish I could go back and save me from being myself. This persona could be given to Hisui; and I could find my own life. And maybe the other things would be better too." Saber: "....what happened to you?" Kohaku: "You really want to know? I didn't think you would want to hear about that. But if I tell you, you have to promise to tell me about you too, okay?" Saber:(smiling) "You're sneaky, Kohaku."
To Kohaku; apparently dying from Gilgamesh's Enuma Elish attack.
Saber: "....why did you do it?" Kohaku: "I wasn't ready for you to leave me. If you don't understand why I did it, then trying to explain or argue is meaningless."
You just want to give Hisui a hug when she hears what happened to Kohaku.
After completing Stage 27, Sakura is abducted by Assassin, Rider is temporarily removed from the battlefield and Akiha is incapacitated. Only Hisui is left standing to face Archer, who has been given free rein by Nanaya to slaughter those remaining. What does she do? She interposes herself between her stricken master and he of UnlimitedBlade Works.
Hisui: "Akiha-sama has always taken care of me...and Nee-san. And that is why...That is why I will protect Akiha-sama!"