Sam jumped... literally... when Matt introduced himself. A precarious thing to do when you were so unbelievably high off the ground.
"Holy mother of," he shouted, clutching at his chest and turning a slight tinge of green as Matt spoke. "Do not," he said, his words broken, "Do not sneak up on people like that," he said, grabbing onto the tower to try and steady himself a little bit as he regained his composure, noticing out of the corner of his eye, a familiar looking witch fly up to the tower, presumably to help out with the reconstruction as well.
"Hey there," he said, a little calmer now that he'd assured himself he wasn't about to fall over the edge. "I remember you, but nice to meet you properly Sophia.. and you, you were the Minister wont you?" He asked, his eyebrow cocking as he looked at Matt. "I'm Sam, fourth year Gryffindor. And you're right, nothing's gonna get done with just me up here," he said, chuckling a little. "Anyway, I am a little scared of heights, but I like flying to... weird combination, I know, but what're you gonna do. I feel a lot more secure when on a broom than I do up here, I have to admit," he told the two of them, shaking his head and returning to his work. "As you can see, I've repaired a level of the walls, but the thing I was stuck on was the inside. Rebuilding the tower itself is going to be easy, but the inside is what's gonna get me. Furnishings are covered by the elves, but the staircases and individual rooms were just lost on me," he told them, scratching his head a little.