You are a part of the akastuki, a pretty strong member. Which means you normally wouldn't be getting hurt. Until you came across Kakashi. During your fight with Kakashi the shinobi managed to cut your arm off.

Despite not wanting to retreat then you had to and that's how Kakuzu ended up finding you. Right now you were currently sitting in front of him getting your arm sewn back on by him.

"How did he manage to sneak up on you anyway." He said as he was focusing on saving your arm