The situation had quickly gone from bad to worse. His teammates were tied down, chakra at a low and Kakashi-sensei wanted to see how he would react, so he wasn't getting himself out of his restraints. He was running low on chakra himself and if Kakashi wasn't going to do anything that left it up to him. With a kunai lodged in his arm, he pulled out his six-shooter. The weight was familiar from long hours practicing.
"That's-!" Kakashi says, stunned.
Naruto, without thinking, aims and fires, but his aim was off because of the kunai, and the bullet hit an inch lower then where he aimed. His gun quickly makes it's way into it's holster as he runs towards the injured ninja, cursing. "...should have known! Don't die! Stupid-..."
"What was that?" Sasuke and Sakura ask confused.
Naruto ignores them and hurries to bandage the man.
"You've got some explaining to do Mister..." Kakashi says sternly, magically free from his restraints.