Quoted from Meorrow:
When the ball goes down an inlane, the opposite orbit will light up. It doesn't stay lit for long - you *almost* have to send the ball through the orbit as it's leaving the inlane to get it in time, though I've managed to brick the shot and still get it up there with a second try occasionally.
Ok, is that only after qualifying the reactor with the keypad (9x9 grid in front of the standups)? Seems to be.