In Saw, why does he lay in the middle of the floor pretending he's dead?

what kind of bullshit twist is that? The dead guy gets up and leaves the room and we realize he's the killer. But wtf was he doing there in the first place! and if he's trying to help people why does he say cheesy things like "game over" and freak people out with that puppet? I dunno, seems pretty stupid to me....
 
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