Obito turned, just enough that Deidara might have caught sight of the fan appliqued to the back of his jacket, when Sasame spoke. He hadn't noticed him before, he'd been excited to find another ninja that hadn't disappeared yet. After glancing at the white haired man, he quickly turned his attention back to the other ninja. On closer inspection of the forehead protector, Obito noticed that he wasn't just standing in front of a Rock-nin. This man was apparently a missing-nin as well.

Well crap. Kakashi would just love this. Way to not pay attention. But the man was wearing the same outfit as Zetsu had been, so maybe he was okay...

"I-I'm Obito..." he said in not as boistrous a voice as he usually used.