Marcus was getting more pleasure than he probably ought to out of listening to Tonks marvel at the mechanics of the amusement park rides. For him, trained as he was in 23rd century maths and physics, the scientific principles at work in the machines that surrounded them were simple to understand, though their mechanized execution was awesome to behold. He had become so accustomed to being surprised by the amazing and irrational things that Tonks could do with magic that it was nearly thrilling to have the shoe on the other foot and be able to wax mysterious about the forces at play all around them.
Once they arrived at the food vendor, however, his hunger took priority and he examined the menu. Most of the items on it were pure junk, from a nutritional standpoint, and he couldn't imagine why anyone would willingly ingest them, but, of course, they did, even in his time period. Nevertheless, there had to be something here with redeeming nutritive qualities.
In the end, the Ranger orderd a caramel apple and a bowl of chili. That way he was at least having protein and a piece of fruit. Waiting for his food, he turned to listen to the conversation Tonks had struck up with the other fellow waiting there. He looked like he might have been more comfortable in the European Renaissance theme than this noisy twentieth-century one. Marcus didn't say anything but watched the two fish-out-of-water discuss their surroundings.