The boomerang should curve around to the left, climb gently, level out in mid-flight, arc around and descend slowly, and then finish by popping up slightly, hovering, then stalling near the thrower.
Throwers can modify various actions to achieve a closer return according to the conditions; the throw angle to the wind, the tilt, the power, the spin, and the inclination can be adjusted to vary the return point so the catch point can be perfected.