Barbara had warned him that Cassandra was on her way home, and Bruce heard the sound of her bike's engine as she roared back into the Cave. From his place at the computer console, he began closing down some of his screens, narrowing his focus from, among other things, his daughter's apparent new boyfriend, to the ongoing Scarecrow problem. No use upsetting her right away, but there was no conceivable way he was going to allow one of his own to disappear for a week with someone and not know everything about who that someone was.
Listening for her approach, he waited until he heard her get close enough before turning around to watch her close the rest of the distance. Bruce knew she could read his body language, and he wanted her to.
He wasn't happy. Bruce had never been very strict when it came to the comings and going of his children. Of course he worried, but he'd always been able to keep an eye on them, no matter where they went, or for how long. Bruce had been watching Cassandra over the past week, making sure she was alright, but it wasn't the fact that she'd run away the was bothering him, per se. He was upset that she hadn't bothered to come to him at all in the first place.
Looking her over, he noted her appearance, taking in everything before lifting an eyebrow to ask her if she was okay.