Professor Lucas Lepri demonstrates how to counter an over-under pass by neutralizing the opponent's pressure and attacking the arm. When the opponent initiates the pass, Lucas pushes the head away to create enough space to pass the leg over the neck and shoulder, setting up an armbar. If the opponent is too heavy to create space by pushing, the technique transitions into a Kimura trap, where the hips are lifted and the leg is threaded through to isolate the arm. Lucas emphasizes keeping the feet positioned to block the opponent's hip movement, ensuring the opponent cannot clear the leg or finish the pass.