OK, so it is not the 3rd last motion in Sipjin....can you find a picture of it because I am not sure what block you are referencing. Sorry!
Of course, my mistake. I can not find a picture, but it is exactly that 3rd last move in Sipjin (If I'm remembering correctly this time) but the fist is closed and you take away the supporting arm (placing it on the hip), this also means the ready position for the hands is the same as a palm facing outwards body block, except the hand starts facing the other way. A little confusing I know, but do you understand? I'll try and find a picture.