Jessica told Kevin about her power. Kevin told Jason, who told Alex, who told Paul. Half the house knows she has a power and she is accidentally having a Cook Islands Yul affect from Survivor. No one wants to take a shot at her knowing she can just play the power and nullify anyone's HOH.
Some details: The Halting Hex can be used AFTER the votes to evict are cast but not before Julie reveals the results. Jessica told Kevin that production is hinting at her NOT to use the Halting Hex this week.
I can't... Alex is such a fucking dumb bitch