Barty had stolen a Time-Turner from a professor, and was figuring out how to use it. He just wanted to go back and fix some things, but he ended up going back years earlier.

It's 1950, Hogwarts. Barty looks around, completely surprised at where— when he ended up. He looks around, quickly noticing his father when he was young and just ignoring the old man and deciding to walk around.

He couldn't be caught, no matter what. His restlessness was already becoming evident, and the nervous tics he tries to hide hit him with precision.

He was getting anxious, it wasn't good. He was far from home. Lost in the past.