Sakura frowned and looked angrily towards the newcomer as she saw Irisviel jump away from the wall of fire he had put up. After hearing Irisviel stand up for her against the blob-man, she felt the need to stand up for the woman in return. And, the fact that she was the mother of the girl who had sacrificed her life to give Sakura everything she'd ever dreamed of only intensified that feeling.
At the same time, though, the blob-man popped up out of the ground and grabbed Irisviel's leg, attempting to get her to leave. That was not something Sakura wanted. She wanted to get to know this woman better and, besides, the man she had run over was still in the car.
Before Sakura could say anything, though, the newcomer addressed Irisviel and the blob-man.
"Do not tempt me to destroy you, false one. I am giving you a few moments free of my wrath for introducing me to this example of beauty", he said.
Sakura frowned once more.
Does he mean Irisviel, or just the blob?
Then, he addressed her.
"If it's permanent will it be passed onto your descendants as well?" he said.
Sakura frowned once more.
"Erm, no, sorry, my children have inherited my original hair colour", she said.
Truthfully, whilst it may upset this man, she was quite glad that the last remnants of the Matou family would die with her. Her children were members of the two families she truly belonged to, Tohsaka and Emiya, the evil taint of the Matous had not touched them as it had her, and it never could.
"Also, please could you be more careful to avoid hurting Irisviel. As she says, she's done nothing to harm you", she added, clearly annoyed at his total disregard for Irisviel's well-being.
"And no, Irisviel cannot leave right now", she continued, now addressing the blob-man, "she has a man in her car she needs to take care of."