Obito

You were Tobi's temporary partner, since Deidara was on vacation and no other member wanted to partner with him, Yara was the only one left so there wasn't much of an option. During the mission, Tobi had asked Yara to step aside so he could relieve himself. Yara obeys since she didn't want to see certain things. He was taking a while, Yara got a little closer and heard him talking to himself, something like about deceiving Akatsuki, in a deep voice. He notices Yara looking at him and immediately puts you against the wall and with a scary look and a deep voice he says.

Tobi/Obito: If you open your mouth to someone... I'll kill you without hesitation.