Screaming or howling

Today, I had another nightmare. However, just like last night's dream, I did not wake up with a start or a scream. I was waiting for the other three members in my study group in a room, which apparently belonged to the university. I was soon accompanied by the new guy F, who I have only met once for real. I did not really like the atmosphere he created in the room in this dream. It felt calm in an eerie way. Shortly, A also showed up, but she turned around again, saying she had to take care of something first. A few minutes later, J appeared and I felt small and delicate next to F. I immediately explained to J that A would be back soon. J acted a bit weird, though. He did not even look at me and turned around at my comment, apparently to search for A instead. I felt a bit abandoned by the other two. When J had left and shut the only door, which was now on the top of a slope, I noticed how much the room had grown. When F and I were alone, the room grew even more and the walls turned into a dark red. F felt even creepier now and at the same time he seemed amused to have me all for himself. His body started growing, turned pitch-black with white eyes and he grew horns. He soon melted into the wall above me. His body became fully merged with the red wall and disappeared, but the devilish features of his head could still be seen. He started talking in an evil and menacing voice. I cannot recall what he said, but he repeated a few sentences several times and I felt uneasy by his words. Then I woke up.