Jeff Probst wrote:
Pre-merge the rules stay the same. One person selected from the winning tribe will boot one of the two in the tie from the losing tribe.
Post-merge the rules change:
We decided that individual immunity and having to choose which person to boot was too per-determined... it was like the game was over before tribal council began.
So when there is a tie, the two people in the tie will compete in a challenge. The winner of that challenge will then vote out someone else in the game who was not in the tie. Immune person is safe as always as is anyone who played a HII.
The challenge will always be a version of Mastermind in which both people pick a color code and have to solve each others.
Wow, would suck to be sent home that way!