Yes.

Would it be possible to reap without the OP knowing they've been reaped? Have posts go invisible to everyone else while the 'brigged' member is still able to view them. Maybe even allow them to edit and reply to threads all while no one else can see them. (Ideally keeping them blissfully ignorant).

References:
• Clive Thompson on the Taming of Comment Trolls : Wired
  • See second half of the article on making troll posts invisible
• Anger Management for Online Trolls : Wired
• Redesigned YouTube Takes Aim at Boob Tube, Trolls : Wired