My friends and I had this bug happen to us twice tonight, here is the process that happened,
player loses control of character,
players fps drops really low,
player dcs (drops from game) on their end,
the game shows them as still in the game,
round ends when all players are killed,
winning player spawns on the map without fire ring,
other players can walk around the map and use abilities, but cannot see anyone but the player that won, (the abilites dont have projectiles but still make noise) (the player that won cannot see anyone)
The lives in the top left show the dced player and winning player as alive in the round (seen in the first picture)
from here we had the lobby host close the lobby and all of our screens went to the picture of clouds (seen in the second picture)
This bug happened with 2 different players in two different games (but both with the same host)