Colin wasn't one hundred percent sure that they were fictional, this could have been a muggleborn made documentary attempting to bridge the gap between worlds. Or maybe it was a situation like Goodland where someone had gotten to meet Harry and somehow retained the information. Maybe they even thought they had created it themselves. Colin refused to think of himself as fictional when he was there, when his whole family existed outside of the scope of this movie. It didn't make sense that they would exist if they were all fictional.
At first, watching the movies had been nostalgic. He remembered all the silly, crazy things he'd done in his first year. He remembered taking Harry's picture and testing experiments for the Weasley twins so he would have coin to buy candy from the older students who went to Hogsmeade. He had been confused when Dennis never showed up, or when his name changed but it was a movie and they were actors. Movies were like that sometimes.
But as the story went on, Colin grew anxious. When the fights started and the muggleborn started getting rounded up, he remembered the nights in the tent-- hungry and cold and too scared to sleep. He fidgeted more and more as the movie played.
Honestly, Colin almost missed the shot of the dead teenager, Nigel, the Not-him-him. Colin's breath caught in his throat as he tried to process what that meant. He was just an actor. This was just a movie. He was shaking by the time he found his voice.
"But my brother, he's okay, right?" He wanted to ask if it was true, but he couldn't squeeze that part out. He knew that Nigel had seemed to be a composite of the two of them, and he had to make sure that at the end of the day, Dennis would be okay.