Apparently, new rules. (At least, these weren't the rules I thought were being followed this season.)
Then, the Top 12 artists will be determined as two artists from each team will be sent home on “The Voice” Live Playoff Results Show, Thursday, November 8 (8-9 p.m. ET). In the first elimination show of the season, the two artists who receive the most viewer votes on each team from the previous nights’ Live Playoffs, will be saved and guaranteed a spot in the Monday, November 12 Live Show. Meanwhile, each coach is tasked with the difficult decision of choosing one more artist from the remaining three to move forward in the competition and perform in the next week’s Live Show, thereby eliminating the other artists.
From the press release at:
I thought that they weren't ensuring that some singers from each team were guaranteed to get through?