First this requires two people. One person has to be a level 50 jugg/guardian.
You have to start on attacking side first, to use this exploit.
First you want one person to jump on the left or right pillar, and the jugg/guardian to jump on the opposite pillar.
Description->The two tiny pillars in front of you when you spawn in as an attacker (to the left and right of the door that unlocks when the match starts) you can jump up on these.
Now, have the jugg/guardian intercede/guardian leap to the other player on the opposite pillar.
This will cause the jugg/guardian to be pushed over the wall, now they can run to the first door and cap it. For better results, you can run PAST the door and cap it from the inside.
Be careful though, if you run too far, when attackers die, they'll spawn on the spawnzone thats next to the bridges, and you wont be able to cap the first door at all if everyone dies.