Rider
Rider smiled at Sakura's cute reaction as she snuggled into her home-made Shirou toy before explaining how she had taught herself how to sew, one eye on Vanguard as he/she entered the room discreetly.
Wow, that is impressive, to produce something so good without any real training or much practice, Rider thought.
Before she could compliment Sakura, however, Vanguard spoke up.
"Forgive me for interrupting your pleasantries, Sakura. An odd looking wraith calling itself Archer has appeared before Rin. Apparently an acquaintance of sorts, would you know anything about it?" he said.
Rider smiled at his words. She had noticed the presence before, and had worried about what it might be, but it could not be a co-incidence that someone called "Archer" had appeared before Rin, and if she was correct then she was sure that he would not harm her, given how positively she always spoke of her former servant.
Her smile soon disappeared, however, when Sakura began to go into a panicked state.
"Nononononononononono", she began to say as Shirou grabbed her into a firm hug, calming her for a moment before turning to order Rider.
"Rider, go get Rin!" she said.
Rider frowned. She was sure Rin would not appreciate being "rescued", but she also knew that disobeying Sakura's orders would cause a significant problem. Leaving as ordered, she addressed her master through their mental link.
Sakura, are you sure? I do not think Archer would harm Rin, and if he was a danger then Vanguard would have dealt with him or called for assistance, she said as she began to leave the room.