Five minutes into the class, Harry's worst fears were realised. While going through some basic manouvers, his glasses got knocked off. He stood there frozen as he met his partners eyes, and all at once their whole life was his, their potential future, in the blink of an eye. 

Getting lost at a shopping centre, hunting chocolate eggs, laughing, crying, running around. Memories that weren't his own poured into him, shattering the spell that held him, as another voice was added to the others. 

He fled the classroom, only stopping to scoop up his classes, shoving them on again, and running down the hall, tears stinging his eyes. He just wanted to get rid of everything, to not have seen what he had seen.