Harry had spent the walk to the common room trying to remember every detail of the castle, every turn and off shoot, he hoped that this would make it easier for him to find his way in future journeys, the walk had also been an interesting opportunity to see how the other students reacted to his presence. Some choose to try and antagonise him, pushing past him like he wasn't there and this wasn't worrying to Harry, it meant they didn't like him and had made this clear, this group included those like Draco. Some chose to treat him like any other child, not interacting with him not because they didn't want to but because they didn't actually know him or just didn't care, that was fine by him since he didn't like the idea of people following him around just for the sake of it The final group was what Harry was keeping an eye on the most, those who looked at him but did nothing, those who watched him when they thought he didn't know. These were unknowns and that put Harry on edge.