One day, one class

Walking through the crowded building I noticed Billy walking in the opposite direction. I knew we had class together but I also knew that he was headed in the wrong direction for that class so I ask him what he was doing and we pressed on to find room 116. On our way there we found our old classmate Nate and my friend Karen. But something was odd, our teacher, Susan, was not in the class room. Some older gentleman was. As we gathered in the class room he walked out leaving papers, books, and the projector on. The four of us sat around the table wondering who this person was and where Susan was. Not two seconds later our beloved teacher poked her head in noticing a few of her students and someone else's stuff sitting on the table she should have been lecturing at. After a quick hello and setting her own belongings down she rushed out the door to figure out who's stuff was sitting on the table. When got back another professor came in, noticed we were not his class, and left.