I joined a lobby a few weeks ago, not realizing this was what the host had in mind by presetting it to Glacier and bringing a Jug. Once the game started, he got on his mic and said "Follow me, this is what we have to do to win on this map." Games that start with the host saying that are the games that usually do not win.
So I followed the herd to the dark room. He instructed us to camp there, his Jug at the front of the room, the rest of us in the back. When Wave 1 started, HE BACKED UP TO THE REST OF US and PUT HIS SHIELD IN FRONT OF US. It was literally 3 feet from the back wall, with us in between, including the Jug! Needless to say, everyone went down almost immediately. I managed to escape, then realized it didn't matter, because I was quitting.