Is it just me, or can the Cyberdemon be heard on levels before the last one? I think it was around level thirteen or fourteen that I heard him stomping around somewhere out of sight, then a bunch of explosions and roars, then the sound of the Cyberdemon dying. Sounds to me like the giant is a bit irritable and gets in a firefight with anyone around him whenever I get to the level, so I have not yet caught him. Is the Cyberdemon's sound affects from Doom just given to another monster, or is he toying with me?