It is an extracurricular task where you have to hit the person at the top of the leaderboard, and win, to then replace them in the spotlight and earn points. The longer you hold the light, the more points you get.
You have to hit the person in the #1 spot on the spotlight leaderboard. If they're too strong you can try and eavesdrop. If they're dtw (defender too weak, aka out of energy) you might be able to take it from them.