BB 16 Frankie Backstabbing Zach Im doing a rewatch of BB16 currently. Currently I just watched the episode were Frankie turns on Zach when he is HoH. I think Frankie is a good player, but I just cannot understand this move? Can't Frankie just put up Victoria, which forces Derrick to lose either Victoria or Cody? Can somebody explain to me the reasoning for this move? I know Zach is a loose cannon, but he's closest to Frankie so I just cannot see the reasoning. 

I would think the move this week would to protect Caleb and Zach who seem to be Frankies best allies.