Told by Last_Precure

I was in the 9th grade which is what I think is equal to 9th grade high school in America. I went to school in a town called Hirschhaid. My village is called Schlammersdorf and since the school bus picks up a bunch of kids from other villages, my bus came at around 5:40 a.m. I usually got up really early and by 5:15a.m., I was ready to leave the house. 

One day in March, I went through the same routine: woke up, got dressed, had breakfast and got ready to leave. But that day, something strange happened. As I put on my shoes, I heard a knock. I looked up at the door that connected the apartment of my grandparents to the hallway. My grandparents had one of those doors with glass except this one was translucent so you couldn't see much.

I saw someone standing behind the door and waving at me. It was normal for my grandpa to sometimes watch me and say goodbye while I leave so I was sure it had to be him and waved back.

I left the house and said, "See you."

During this time, I had one problem while going to school. On the way to the bus stop, there was one house with a creepy old man who would slam his hands onto his window whenever I passed by. I even thought of using another route but it would take too much time and I might get late.
So like every other day, I walked past his house. On this day, everything was calm. I was even brave enough to look at his house and I saw him just standing there, looking at me with a  terrified face. He did nothing but stare.

I didn't think too much about it and headed for the bus stop where I always chatted with a girl from my village. On that day, I told her the creepy guy did nothing. She was always worried about me since I was so scared of the old man. 

As the bus came, I put on my headphones and boarded it. I sat down and listened to music. Suddenly, I remembered my grandfather shouldn't be at home. He was admitted in a hospital in Bamberg and my grandmother was way too big to fit the figure I saw standing behind the glass door.

I don't know who or what I encountered that day but I still think about it quite often. This happened in the year 2014. To this day, I still think about it. Who or what was that? Why did the creepy guy do nothing that day but watch in horror?