The hcb+B, hcb+D is a link, but it only works when you're canceling into hcb+B from trap shot (dp+kick). Do the motion early and when you press the button, hold it down. When you hold the button down on special move links, it repeats the inputs for you and you don't have to time it.
Just go practice dp+K (or EX) into hcb+B, hcb+D, qcf qcf+AC in the corner. Do the motion early and hold the button down.
Just go practice dp+K (or EX) into hcb+B, hcb+D, qcf qcf+AC in the corner. Do the motion early and hold the button down.