From the preview based on the demo:
"The short demo didn't offer any insight beyond a surface measure of how co-op will actually work in the final game. (At least, I hope so.) You'll open doors together, assist when a zombie has glommed on to your partner, etc. or split the attention of the larger enemies -- that actually felt pretty good during a battle with a gargantuan "infected" -- but it remains to be seen if it gets any more complicated than that."
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