Regulus split from his brother and Lupin. He knew they wanted to talk and he wanted to be away from more hugs. He couldn't remember the last time he'd been hugged. Maybe his father's death some eight months before, and his mother didn't hug like Sirius did, as if he couldn't breathe if they didn't hug. A little space before Sirius decided to hug him again was preferred.
He began covering the second floor. He didn't expect to find a lot of people, but there had to be more. It made logical sense. Unless the castle couldn't process that much magic at once. His doubts were soon dispelled by the voice of a woman. The gentle sex, his arse. He'd grown up with Bella, so he had his hand in his pocket, near his wand.
He walked toward the voice and then stopped when he saw the woman. "Hello, Miss-" He stopped were he was, because he had no intention of scaring her or getting hexed. "My name is Regulus. I've just arrived here with some other people. We are looking for others that might have arrived as well."