Sasuke's Story, Sunrise, Part 3: Fūshin Naruto: Shippûden : Season 20 Episode 486

Orochimaru brings Sasuke to the Coliseum fighting ring, to lure out En Oyashiro, who may have some information regarding the Exploding Human incident. The match is called off when more Exploding Humans appear and the opportunity to meet Oyashiro seems lost. However, impressed by Sasuke’s Sharingan, Oyashiro approaches him in person.