Darkness Beyond Time

I was in some map at CoD4. I walked around some house and suddenly I started running. I found myself in some dark field it was night and I saw my friend there. Suddenly some dog started chasing us. The dog had many chains connected to something behind him. We started running down the field when I jumped and started flying...Appearently I flied all way to my town. I remember being on place called "Stari Grad" and I was going somewhere...