Sakura and Shirou
Sakura smiled politely at the man as he spoke, informing them that he too was a guest of Irisviel's, and asking if his companion could also be granted entry. Not wanting to leave the woman standing outside in the cold, and figuring that a kind woman like Irisviel would feel the same way, Sakura decided to accept his request, paying little attention to the shock the woman had seemingly shown when she had first opened the door.
However, before Sakura could offer her acceptance, the woman spoke up, greeting them politely but emotionlessly, her gaze cold and expressionless. Both Sakura and Shirou could tell that she was clearly uncomfortable for some reason, her hand clenching and, somehow, crushing the suit of armour she was carrying, which in itself seemed odd.
Despite the woman's odd behaviour, however, Sakura felt it would be impolite to deny her entry. At first, Shirou agreed with this assessment, intending to leave the judgement up to his wife, who knew Irisviel slightly better. However, then he realised something.
That helmet, I've seen it before, he realised, a look of surprise and worry coming over his face. The armour-man at the other Sakura's house was wearing it.
Possible scenarios flashed through his mind. Had the woman attacked the man? If so, had he also harmed the other Sakura? And, worst of all, was he going to harm them?
Stepping forward protectively, Shirou addressed the newcomers.
"Excuse me, where did you get that armour?" he said to the woman, tensing up.
"Shirou?" Sakura asked, questioningly. "What's going on?"
Shirou turned around to her, holding his mouth to her ear.
"That suit of armour, I saw it being worn by someone in the other Sakura's house", he whispered. "I want to know how she has it."
Sakura frowned.
"I see...", she said, stepping forward also and quietly summoning up some of her shadow tendrils in case she needed them.
"I'm sorry", she said, politely to the man, "but my husband is worried about how your friend came to be in possession of that armour."
Then, she turned to the woman.
"Could you please answer my husband's question?" she asked, politely. "If you will not, then I am afraid I cannot allow you in."