Marcus was sure that his eyebrows were furrowing together in confusion at the tail end of that comment, but decided that it was better to not question it, and take the comfort offered, because really, before now there wasn't much of anything he could have done to lessen his own ignorance.
He returned Roger's grin with a small smile of his own before frowning after the individual and whatever contraption he was riding. Making sure to keep track of where Roger was in relation to himself, Marcus found himself getting distracted by things that were probably incredibly mundane, but were unlike anything he'd ever seen before. Once they were inside the train station, it was easier to focus, if only because he was at least familiar with the concept from the Hogwarts Express from school days. Still, he followed Roger's instructions after a careful observation, making sure to stick close to the other man as they made their way through the station - the last thing he wanted was to get separated and then get himself lost and confused. A part of him was tempted to reach out and hold on to some innocuous part of the other man, but something about that didn't seem like a good idea, even though with the crowds he felt like he was completely invading the other man's space.
"How many stops are there total?" he asked, curious, since that was different from what he was accustomed to.