If that is the issue and we are talking about the evil DS then wouldn't they just use real bullets and kill ppl for real in a random location?  They have no conscience, so their only motivation for not doing that is to protect themselves from prosecution.  At this point, they know they are going to be prosecuted.  It's like the mass murderer on death row who knows he is going to be killed has no reason not to kill again.   I guess if that is true they might think that they don't want to commit the crime that triggers their arrest earlier than it would be.  They seem to be bargaining for weeks at this point.