James blew by George Hill at the top of the key, dribbling to his right before snaking back to his left as he approached the protected area. Once in the basket area, James rose for a right-handed slam, going underneath the hoop to the left side of the rim as he executed a corkscrew-style slam with Paul George looking on.
The officials gave James an and-one on the play, for good measure, as replays showed that Hill contacted James' left arm as he prepared for liftoff.
James' dunk was his top highlight in a night full of them. The four-time MVP finished with 32 points (on 13-for-21 shooting), 10 rebounds, five assists, and two steals in the win. Chris Bosh added 25 points (on 7-for-12 shooting) and six rebounds for Miami.
After exchanging some barbs with James during and after Game 3, Pacers guard Lance Stephenson tallied just nine points (on 3-for-7 shooting), five rebounds and four assists. Paul George led Indiana with a team-high 23 points (on 8-for-16 shooting), seven rebounds and three assists.
The Heat now hold a 3-1 series lead over the Pacers. Game 5 is set for Indiana on Wednesday.