Compared to the mouse, uninstrumented in-air interaction has been shown to be slower and less precise for pointing. Yet, in-air input is preferable or advantageous in some interaction scenarios. Thus, we examine a three-device hybrid setup involving the mouse, keyboard, and a Leap Motion. We performed a user study to quantify the costs associated with transitioning between these interaction devices, while performing simple 2D manipulation tasks using the mouse and Leap Motion. We found that transitioning to and from the Leap Motion takes on average 0.87 s longer than those between the mouse and keyboard.