The secondary starts with a perimeter (2) inbounding it to the point guard. The 5 rim runs and the 4 gets on the ball side wing. Another perimeter (3) is opposite the point guard in the slot. The point guard dribbles it down the sideline. The 4 runs a shallow cut and gets the ball at the ball side slot. The inbounder basket cuts and fills to the back corner. The point guard hits the 4 cutting up on the shallow cut.
The point immediately cuts through to the opposite corner on the pass. The 4 reverses to the other guard (3) who dribbles to the top of the key, back in the direction of the pass. The 4 spaces away to the wing and the perimeter in the corner spaces up with the dribble over.
The 3 throws back to the 2 in the wing/slot area. They received it in both places from what I saw.
The 2 swings to the 3 on the wing immediately. The 4 slipped the fake ball screen, catches the ball wide open mid lane, and then make a play.