The hiding place

Slowly, they descended from the darkened sky, like dozens of huge birds with no formation. What were they? Were they dangerous? I looked around me at the rest of the class. They all just stared out of the gap between the blinds of the window. I felt like I was going to puke. Never had I been so scared in my life! The things in the sky were getting closer to the ground now. Should I run? I asked myself. But I stayed put, I was probably safer in here.