Under lock and key

I remember going to the jailhouse the next day, if only to see my friend again. However, the gruff stallion at the gate scowled at me. "Such a nice filly shouldn't be with such scum," he said, on the inside of the jail. I implored him to let me see my sister, and finally he roughly agreed. "And only five minutes, Greyscale!" he called after me, as I ran down the cells looking for the midnight colored filly with the grey mane. Finally I found her, desolate in the cold cell. She had her back turned to me. "Blink?" I whispered, afraid of what I would see. The pegasus turned around, and then ran full speed at me. She crashed into the bars and took a few steps back. "Wh-what are you doing?" I asked her. She looked at me, then motioned me closer. "The bars are rusty. If I slam myself into them, I can break them down and get out."

   I stared at her. "You're only in here for a day!" She just smiled.