James scored 45 points in another dominant individual display to repel a gusty Pacers side.
And the 33-year-old was given some much-needed support from his team-mates with Kevin Love adding 14 points with four 3-pointers.
Thompson had endured a frustrating series amid revelations in his private life.
But he bounced back tonight with 15 points and 10 rebounds.
While Hill played the last 19 minutes to score 10 crucial points, five rebounds and three assists off the bench.
And James was delighted with their contribution.
James told ESPN: “We started the game with the guys that have been in big games before – me, Swish, Tristan, Kevin and Kyle Korver.
“We’ve been in Game 7 [matches], huge games before. So we know what we want to get out of each and every one of us.
“We split the game in half of Tristan and George Hill. Hill didn’t play the last three matches then came in the third quarter and gave us a huge lift.
“Scoring from the free throw line, making plays not only for himself but for others.
“Tristan was magnificent protecting the rim, getting hold of offensive rebounds, getting the bigs into foul trouble.
“Guys just staying ready, that’s what professionalism is all about.”