Hali's good, but if he wants to be a star, when teams focus their attack on him in pick and roll defensively either by switching or blitz, swinging over to a shooter is as
@Tetsujin said, Rondo level. Now, Rondo with a great step back 3 is really good, but what you saw Mathurin do is what star types do. They take the ball and get it into the teeth of the defense. They'll be a great 1/2 combo for a long time but Mathurin has the tools to be a go to.