The Mystery Begins

I stood waiting in the Stansbury parking lot waiting for my roommate, Amy, to pick me up like she was supposed to. She is not the kind of person who is usually on time so I didn't worry when a few minutes went by. After five minutes my cell began vibrating in my pocket and I looked down at the screen. "Amy Calling" I read and think to myself, surely she must be on her way.
"Hey, where are you?" I answer.
"Well, I'm still at the apartment." she responds. I start walking through the parking lot towards home. I know she's not coming now.
"See something happened," Amy begins, "I was walking to my car in the parking lot and I saw this man. Well, it was more like a shadow of a man."
She sounded really freaked out, but I couldn't figure out why. Amy was always a little easily spooked. Over the summer when I wasn't in the apartment she tied a bell to my bedroom door in case any lurkers tried to come through it! But a shadow of a man didn't seem like something she would be scared of.
"A shadow?" I asked, "Well, what happened next? There has to be something else if a shadow scared you back into the house!"
"I know it sounds crazy, ok? But, it was just weird the way he...it stood there. Real, but not real."