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To the groin or bladder, yes, and following up with a step inward or into the opponent thigh. Is great when the legs are making a bridge to breakdown the opponent's leg structure by thrusting forward.
Great question.

Thanks. Just seemed quite natural to me. The knee being extremely powerful, but underused it seems to me. The bridge, sorry for being a bit thick here, but that would be the passage of travel from the first shape to the actual impact on the opponent?

The bridge is contact. Whether it be the arm, leg, shoulder, hip...etc. Opponent punches, you intercept the motion with your arm sticking; that is the bridge. You step in and makes contact with the opponent's leg and stick, that is the bridge.
Hope that helps.