Except it didn't go down as you described. Flagg did not catch the ball in the post. He got the ball on the sideline, well above the free-throw line extended and beyond the 3-point line. He tried to take his man off the dribble going left to the baseline. Maluach was not in the paint when Flagg started his drive - he was on the weak side low block. Malauch's defender left him and immediately rotated into the paint as Flagg was driving. It was a GREAT rotation by the Maluach's defender that forced Flagg to spin back into the lane. He got a good look in the paint from about 12 feet. Just missed the shot.
Watch the rotation on Flagg's shot - it was sideways, short, and uncharacteristic for him.