Can someone enlighten me on what Jayson Tatum was trying to do here

Jayson Tatum doing some workout during a timeout

Jayson Tatum shakes his head after drilling his 3rd 4th quarter three In the second half alone he had 25 points on 79 from the field and 56 from three

Jayson Tatum receives a delay of game violation after failing to draw a foul on Tyrese Maxey

Jayson Tatum hits the clutch 3

Up by 26 Joe Mazzulla went right up to Jayson Tatum and Jaylen Brown after the timeout and was coaching them up

3 years ago Jayson Tatum dropped 51 points in Game 7