Being knocked out of the arena might not cost you a life in Super Smash Bros. Brawl. The latest update to Nintendo's Smash Bros. Dojo blog shows off a tether recovery mechanic that will allow players to latch onto the ledges as a last-second life saver.
Although the SBD update is very short on words, it's filled with screenshots of how the recovery technique works. The example demonstrates Zero Suit Samus using her Plasma Whip to cling to the side of the platform. Browser just knocked her off, but she caught the edge of the platform and retracts her whip in order to grasp the platform's side with her hands. And, we can only suspect she takes her revenge out on him just after that.