You didn't post the video but I suspect he is using a fixed position (vise) to move the point of aim to match point of impact. That is when the "opposite movement" comes in. In that method, you shoot one round. Then, clamp the rifle in a vise and adjust the vise so that the crosshairs are centered on the target. Then, without moving the rifle, you adjust the scope to move the crosshairs to match the actual impact hole of the first shot. Doing that, means moving the dials in the opposite direction that you would normally move them.
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