Trio VS. Gellert
Ron had just squeezed Hermione's hand back when the door opened. His eyes instantly narrowed as he looked at the man that had hurt his best friend, the man that was destined to become one of the darkest wizards in the world in his time. Ron had never seen Grindelwald before, but as soon as he saw that smile, he knew it was him.
He looked over at Harry and stepped into the house, his expression not hiding the fact that he didn't trust the man at all. Once they were all inside, he stopped, just staring at the other man as though he expected an attack any minute. He wasn't going to pretend to be polite, it had never been his forte anyway. He would let Harry and Hermione do the talking.