What I do is I run while already holding 2 then press 4 when I reach the enemy in the air. Maybe don't let the enemy fly too far away after bounding because it'll be hard to catch up with the air grab. --- Just f*** my 2007 username. PSN: GIZOUGHTE
It depends whether you're trying to do WR 2+4 or iSW.
The former is easy. You just go into a full run and then hit 2+4.
iSW (instant shining wizard) is a bit more difficult and takes some practice. The most important thing to remember is that you can ONLY buffer the FIRST f input. Every other part of the input has to be performed after the animation of the previous move.
To practice this, try doing a jab (or any other move) then pressing the first f before the animation of the jab ends, and then pressing f just after the animation the ends. If you do it correctly, you'll instantly dash after the jab.
Once you get that down, just add another f+2+4 on to the end, and thats it, you just learned iSW. Also good for tick throws.
You can also just do fff really quickly after the jab (or whatever) ends, but I find this more difficult personally. --- UK/EU PSN: SygBoss