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Kakashi notices Tobi has a Sharingan during their brief skirmish, a major revelation for the Leaf ninja.
Tobi (Obito) intercepts the Leaf Village search party (Naruto, Kakashi, Hinata, etc.), using his intangibility to stall them and prevent them from reaching Sasuke. Naruto Shippuden Episode 134
Watch a detailed reaction and breakdown of the events leading up to the Uchiha brothers' fated battle: Kakashi notices Tobi has a Sharingan during their