Hannibal was used to Lindsey coming by, but generally, the lawyer called first. So when he answered the knock on the door and discovered it was him on the other side, there was genuine surprise.
"While it is a pleasure to see you, I hope this is not due to something bad." Hannibal stepped backward in the direction the door swung so that the lawyer could make his way into the room easily.
He could think of no other reason for Lindsey to be here other than it being something to do with the case against River. They weren't social with one another, at least, they had not been before. If this was a new event that was about to happen, Hannibal thought he might let it be known that friend or lawyer, calling was still appreciated before a visit.