Kos-Mos

Can anyone help me with the last challenge of chip, I dont understand how the wall climb P works, cause when I do it I cant follow up with stand HS cause im so far, when I let the cpu do the sample, it does the same but lands near the opponent so it can follow up, I need to research on how does that work so I can finish the combo. Done, the trick is on the back jump you need to hit D as late as possible so when you fall you can continue the combo. Thanks in advance.