What it is
On the drop is how a lot of silvers and F1s actually want it. You set the depth shallower than the bottom, string the shot, and the bait falls like the loosefeed. A dip on the way down is the bite — strike it, do not wait for the float to settle and then wonder why you missed.
It is a waggler and pole skill. It is not a pellet waggler, though the idea is related: the fish are not on the deck.