Despite the singer being the favourite to win, Sally's mentor Sir Tom revealed his decision behind the fast pass at the weekend was a fear she'd be eliminated.
Sir Tom explained this week: "You cant take chances when the public are involved.
"If you want someone to go as far as possible you give them the fast pass and I think Sally deserved it."
He added: "I didn't want to chance it that people wouldn't vote for her."
However Sally revealed she wanted to face the public vote.
"I was hoping to test the public vote, but Sir Tom saved me from that. I've not felt what it's like," she said.
Meanwhile Sir Tom declared his team the best ahead of the semi-finals this weekend.
"To me I have the strongest team because I put myself into those people," he said. "To have Bizzi and Sally there is great.
"Their personalities come through when they sing. I've know what their personality is and to see it come through when they perform."
And the Welsh legend claimed this year's third series was the best yet because people finally knew what they were doing.
"It seems more relaxed this year, the first one we were just testing the water, it was exciting but it was little... now we know what we're doing," he suggested.
The Voice UK airs this weekend on Saturday night on BBC One.