Alastor caught the frown, regarding the older man with curiosity. There were any number of reasons why Charlie might frown at him -- it was a reaction Alastor encouraged in most people, kept them distant. But, given the topic on Alastor's mind, he couldn't help wondering if he was that obvious.
Charlie hadn't offered a seat and Alastor didn't take one. He closed the door behind him, followed by the usual set of wordless privacy and security charms he was beginning to make a habit of casting whenever he spoke to people these days, still thinking like he had at Hogwarts. Leaning against the door, then, he crossed his arms in front of his chest and looked at Charlie for a moment.
"Had a talk with my brother last night," he stated without any preamble. "Now, I'm not going to go prying into your relationship. I'd punch him again if he tried it with my relationships. Frankly, I'm worried about him, however, and before I know how to help, I need intelligence. So, I'm here to find out what your intentions are and if I can count on you to help me help him."