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Season 2 Episode 7, Madara's Big Damn Heroes moment was made even more epic by the way it was presented. As Natsume had temporarily lost his youkai vision, Madara was not physically shown freeing Natsume and carrying him on his back, Madara was invisble except for the gale blowing over grass as he flew. Until the very last moment, when he charged into Taki's youkai-seeing circle, revealing Madara's form seconds before he took a massive chomp on the evil ayakshi, giving Natsume the opportunity to seal it and save Taki.
Season 3 Episode 12, Natsume single-handedly managed to seal a youkai who was threatening to kidnap him, complete with a full moon at night, whilst outside a shrine atop a cliff. It helps that the BGM here is the same as the one that played during the aforementioned Madara scene.