At low percents in Smash 4, characters with bad recoveries like Cloud or Roy can easily be stage spiked, netting an early kill. In these scramble situations off stage, it can be difficult to determine whether you actually need to hammer the shield button in order to tech the stage, or whether it is safe to recover back to the ledge. Well, worry no longer as the Beefy Smash Doods have you covered with this new option select which covers this stage spike situation.
By hitting Up B and Shield at the same time, this OS will default to a wall tech at high enough percents, and an Up B back to ledge at lower percent. This is due to Smash 4’s buffer system, where specials have a higher priority than shields in the buffer queue. If your character can perform an Up B, they will perform the move first. Since at higher percents, the game is unable to get your Up B out in time, the game defaults to the next action which is a shield, thus resulting in a wall tech.
This OS works with any special, so try it out with other recovery methods like Wario’s Bike or Bowser Jr’s Koopa Kart if you are put in a situation where you have to tech the underside of the stage. Do note that you have to wait until your character comes out of hitlag for this OS to work; if you do it too early, neither move will come out.
Source: Beefy Smash Doods