As Yui spoke and gave her answers, the dress around her changed. It would change depending on her answers, going from a short dress to a long dress, long sleeves to short sleeves and even its lower cut changed. The one thing that didn't change was the color. The dress of the wielders of the Fate Threads was always white.
"Yui my dear, I did tell you on that last question that you wouldn't be putting your own life at risk. None of us ever does...it's the lives of others we play with. But alas, if you're willing to answer yes with your life at risk, it seems safe to assume you're willing to answer yes when your life is not at risk. Let's move on."
The two threads that came from above were now hoovering in front of the mirrors.
"Now, like I told you before, it is not our lives we decide on. Instead, it is the lives of others. You might think this makes it easier for us...well, for me it does. But not for you. You see, I've been doing this for a little over five thousand years. Everyone I knew when I was a human is dead. But you're young...and that makes it all the difference. Let's see what the mirrors show us, shall we?"
Athropos made a motion with her hand and the mirrors suddenly stopped reflecting what was in front of them. Instead, they showed a world outside this dimension. There was a plain, a grassy field where shinobi were having a battle. One could recognize Konohagakure no Sato's Leaf Symbol on some of their headbands while the other band of shinobi didn't have any sort of identifying symbol or even headbands. They were rogues.
With about ten ninjas on each side, the grassy field had become a true battlefield. Shinobi tools were being thrown around, shurikens and kunais flew through the air and clashed against each others in a show of sparks. Chakra was being molded and turned into jutsu. From fireballs to water sharks, all kinds of jutsu were being thrown into the fray.
Yui would be able to watch this battle, but there was someone, in particular, she would be able to recognize. Amongst Konoha's fighting force was Konohagakure no Sato's kunoichi- Kanna. She was clearly incredibly strong and by herself she was holding off five enemies while five of her team mates held off one each.
Then a sudden flash of light would shine on the other side of the battlefield, as one of the enemy shinobi gathered chakra to release a powerful Katon ninjutsu. Then, right before he released it time would freeze inside the mirrors.
"What you see here, my dear sister, is one of many possible fates. I will not tell you this is certain to happen, but there is certainly a chance for these events to unfold. Alas, now you're asked to make a choice.
As you can see, the enemy is about to release a powerful technique. Kanna is isolated fighting five men by herself. On the other side, five Konohagakure no Sato shinobi are fighting another five rogue shinobi. Now, your choice.... if you pull the thread on your left..." she would indicate the small thin thread hoovering in front of the left mirror.
"...the enemy shinobi's jutsu will be released against the five shinobi. They will die, but Kanna will be able to survive this encounter and return safely to Konoha. Five lives will be lost, however.
But if you pull the thread on your right... you will be able to save these five lives. The enemy shinobi's ninjutsu is new and untested...if you pull the right thread, his jutsu will come off wrong and instead of being aimed the five Konoha shinobi it will be aimed at Kanna. Make no mistake, she will die there on the spot. But you will be saving five lives and these five Konoha shinobi will be able to return home to their families.
So Yui... choose. Pull the left thread and you forfeit five lives but save a dear one. Or pull the thread pn your right and save a grand total of five lives, but forfeit the life of Kanna. Choose."