I think the laws of inertia would apply. He's moving at sufficient speed and with a noticeable right body lean. The ball is approaching over his left shoulder. Which means the ball's angle and motion coincides with the right lean of the body. What happens then is the catch matches and flows with the right striding movement similar to entering a curve on a track field. Then ZR actually slightly modifies this to a more forward stride while still moving right in relation to the field orientation. If you look at where he ends up it is the right side of the field as he crosses the goal line. Of course Amerson's pursuit encourages his maintaining this action to both outrun and prevent the pursuit from catching him.
Not to sound like a smartass or something but you can actually see what I described. It certainly doesn't take an iota from ZR's remarkable agility shown with this catch. The fact he had to look up and over his shoulder and still make the catch, for me is the most amazing part of the catch. The eye-hand coordination for this, I find to be stunning.