Alright, guys. Let me clear some things up:
1.) This tactic in general has nothing to do with a BLOCKED dash - I just messed up the first example in the video.
2.) HOW IT'S DONE - Just whiff an elbow dash next to your opponent and buffer f,f.
3.) This does take some practice to get down to with the timing. It's not a simple pick up and master in the first minute type of thing. After a while you should get the timing down and it should become second nature, though.
4.) If you play Reptile properly, you should automatically be conditioning your opponent to block after forceball traps otherwise they eat a kick (3) (or misc.) in the face for full combo. Once they respect the above, you can start applying ghost dashing in all forceball trap scenarios to further increase your mix-ups and give you WAY better control over wall positioning.
5.) It doesn't matter if your opponent is standing, crouching, or blocking, this works at anytime. It also works on ALL characters regardless of their hitbox sizes.
6.) Depending on what moves will whiff from the opponent, it all comes down to many variables on how inside you are within their hurtbox , what moves you're using, what attack they're using and etc. So there is much depth to be explored in this regard. The hurtbox and hitbox aspects become very technical at this point so it's hard to further explain in detail but hopefully you guys get the gist of it.
Any other questions, feel free to ask.