I don’t know how to post a tweet. But in this article here if you scroll down you’ll see a slow mo replay of the last Butler play.
https://www.cbssports.com/nba/news/breaking-down-the-controversial-final-few-seconds-of-the-celtics-thrilling-game-6-win-over-heat/amp/
You see clearly that Butler is dribbling and tries to gather the ball to go up for a shot but then loses it, touching it with both hands, and the ball goes back down to the floor, whereupon he picks it up and tries to shoot, but gets hacked by Al. He didn’t “dribble one or two more times” after touching it with both hands as has been suggested.
By rule, still a double dribble but I can see how they let that go.
https://www.cbssports.com/nba/news/breaking-down-the-controversial-final-few-seconds-of-the-celtics-thrilling-game-6-win-over-heat/amp/
You see clearly that Butler is dribbling and tries to gather the ball to go up for a shot but then loses it, touching it with both hands, and the ball goes back down to the floor, whereupon he picks it up and tries to shoot, but gets hacked by Al. He didn’t “dribble one or two more times” after touching it with both hands as has been suggested.
By rule, still a double dribble but I can see how they let that go.