Sakura put on her seatbelt as the white-haired woman buckled-in the guy in the back very securely, before getting into the drivers seat. Then, once she was in the car, she responded excitedly to Sakura's earlier question about the carnage at the hospital, causing Sakura to wince several times as a result of her wild gesticulations.
At first, Sakura took little notice of the woman's ramblings about terrorists and "purple aliens" and a UFO. It was obvious that she had only very garbled second-hand information. But, something was nagging at her, something that said she shouldn't simply ignore the story entirely. Before she could ponder it too much, though, she felt herself pushed backwards into the seat as Irisviel floored the accelerator of her extremely-powerful car, zooming off down the busy street at an alarming speed, showing absolutely no regard whatsoever for the safety of either herself or other road users.
For a normal person, this would be downright frightening, but Sakura was used to it. After all, she had been driven around by Rider when she was in a hurry, and Rider in a hurry drove in a manner that made this woman appear positively safe in comparison. Of course, despite the contrary appearance, Sakura knew that Rider's driving was actually entirely safe, her superhuman reflexes and senses ensuring that she could avoid other road users and obstacles a human driver could simply not react to in time.
Wait, hang on..., Sakura thought as she had a sudden brainwave on thinking of her missing servant.
A purple alien, a UFO, a bright light from the sky, someone smashing a hole in the building to escape.
That could be Rider....
After all, her servant had purple hair and a flying horse that could emit a bright light when used. And, whilst Sakura was very insistent on Rider not causing massive damage or harming people, she knew her servant was not anything like so bothered about doing so as she was.
"Hmm, Irisviel, did you hear anything about a flying horse, or a purple-haired woman in a revealing black and purple outfit? Or anything along those lines", she asked, hoping to find out some more information about her servant.
If it was true, then she was somewhat disappointed in Rider, for causing that sort of damage to a public facility and, therefore, putting many lives at risk. At the same time, though, it meant she was indeed still alive, or at least had been last night. And, whilst the description clearly had Rider as the villain, it could just as easily have been her who was the victim of the attack, particularly given that she seemed to have been trying to escape.