Brad Stevens finished 4th in NBA Coach of the Year balloting this year and his end-of-game and ATO actions are part of that. After his first NBA season, Stevens looked at over a 1000 late game scenarios and improved what the Celtics ran. We can learn from his principles.
John Leonzo provides video of actions to get quality looks. Mr. Leonzo shares quality information on his Youtube channel.
They like "hyperspace" by starting players in the backcourt. They run screen-the-screener action and get Isaiah Thomas the ball with momentum.
Thomas can drive, dish, or Euro-pass to the trailer.
The second action capitalizes on NBA "switch everything" late defensive principles.
They get mismatches with "swings" (e.g. 3-4 combo players) or can get Isaiah Thomas against a big.