That picture? Not a trick. not a private match. When my friends and I were playing lockdown, we discovered an exploit that allowed you to stretch out the game to as long as you wanted so long as B remained uncaptured. Imagine that you started the game of lockdown. Your team spawns A, and the enemy team spawns C. If you let the enemy team cap A and ensure that your team caps C, without letting anyone cap B, the game timer stops. However, no one will be making any progress, because no team has capped 2 zones. Thus, so long as B remains uncaptured, you can stay in a single round of lockdown forever and continuously farm kills until the enemy team finals quits out or B is capped. When we first found this out, we kept going until we finally decided to end the game, but this resulted in me getting more than 100 kills in a single game of crucible. The mechanics of lockdown should be changed to ensure that this is not possible.
Thanks for the report. I will send this to the team to investigate.