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if i was doing deja vu achievment with my guest with a guy and his guest over live and he quits will I still be able to load from that checkpoint or will i have to reload the level?
It's not camping, it's holding the designated location.
You have to play it all in one sitting with all 4 people, beginning to end.
If anyone quits or has to leave, ask'em to stay in the game & leave there box on. However if they Lag out it's over, just finish with what U have even if ur short, but like O.P. said all in 1 sitting.