If you're talking about the bouncy wall inside the Black Garden mission, play the mission with 2 or more people. When you're about to go through the gate into the Black Garden, hop on your sparrow. It's easiest if one person goes through and clears all the enemies while you're on the sparrow. Proceed through the mission until you get to the wall. Once there, just drive right through. Other players can join you inside if they leave to orbit and rejoin you. Have fun exploring. Protip: when exiting, have a competition to see who can get launched the furthest. ;)