So I just wanted to make one thing clear the Borg in this episode were the ones Picard dealt with in First Contact right? So why didn't Picard scan the surface before he left and see that there were still Borg down there? I remember him saying he didn't want to contaminate the timeline, but didn't he do just that? The episode implied that Picard through a paradox set the wheels in motion for the Borg attack right? Can anyone explain why Picard would leave Borg down on the surface before returning to his time?