He said reverse SHDL (reverse B), I'm thinking he wants to know to do reverse lasers/retreating lasers.
Reverse B = tap the opposite direction before you press B. This was possible in Melee and Smash64. You do your neutral B move in that direction keeping the momentum you had from your jump (in this case, your short hop)
B Reverse = Press B then tap the opposite direction immediately. Again, you will do your neutral B move in that direction, however, you will change your character's trajectory. Instead of moving in the direction you were originally going, you will go the opposite, most likely ending up where you started your jump.
i think found a better way to SHDL. ill try to get a video up soon to show.
Just tell me, why go through the trouble of making the video first if you currently "think" it's a better way.
Other effective ways I can think of is doing it well raising off the ledge so both lasers can hit the shortest of characters.
Sethlon method doing the move high when you know they will try to jump.