Professor Lucas Lepri demonstrates a sweep from deep half guard. He starts in a position where the opponent has blocked his attempt to take the back. To counter this, Lucas transitions to deep half guard and uses his feet to control the opponent's ankles, hooking one ankle with his instep and the other with his toes. He then brings his knee towards his chest and rocks back and forth, using his momentum to sweep the opponent forward. Lucas emphasizes the importance of keeping the opponent's feet elevated to maintain control and prevent them from blocking the sweep. Lucas finishes by explaining how to use your legs to twist the opponent over and complete the sweep.