The Sausage King of Chicago.
I was just playing when this Glitch occurred...
I went into the Firefight Lobby, and instead of one of the Firefight Maps showing up, the image of the First Campaign Mission (Prepare To Drop) showed. And, on the bottom of the screen where it normally shows the Map and Difficulty (Ex: Crater on Normal), it simply showed "on Normal" as if there wasn't a map loaded.
Anyway, when the map loaded, I selected Begin Firefight, and then I was on the bridge of the UNSC Say My Name (The Place Where The First Cutscene takes place). I couldn't move, as it showed My Gamertag and Flying Camera under it (As if I were dead), but I could use the Flying Camera to explore the map. It was possible to exit the bridge and explore the space around me, but the pink/red boxes indicated that I was exiting the barrier were displayed.
I know it is hard to explain, but has this ever happened to anyone else? I will post a link to the game if it ever shows up.