In .Hack the whole thing was you were put into a coma if either a Data Bug, one of the Eight Phases of Morganna killed you, or an AIDA or an AIDA infected person did you in.  You didn't technically die, but here in Eden, you do die the same way you did in the game.  Right now it's isolated to certain powerful creatures, but as it happened in .Hack, it will spread to nearly every monster and NPC enemy across the board.  Even PCs killing each other will result in reality based deaths as well.  It goes beyond that however as my next news broadcast will tell however.