(Starting Mist Finer: Lv.1) Faust has a weird hurtbox on the wall during Dust homing that would cause Johnny's 5H to whiff. You can add 5S after 6H, but note that it would cause changes to later part of the combo due to increase in pushback. You do not need to use 623K for timing; you can also whiff 2K after 6H and walk forward for 2D.