My MC is a modern girl with some self defense training. In this scene she's stuck in ancient Meosopotamia and is ambushing a thief to get back what was stolen from her using a modern behind the back arm hold that the thief has never encountered before. The problem is, I've only ever seen this done on TV, and have no idea what it's called, or how it's actually done. This is what I've got so far. I need to know if it's realistic or not. I waited until he was a step past me and grabbed his wrist at the same moment I kicked the back of his knee. The movement dropped him to his knees while pulling his arm painfully up behind him. I kept pressure on his arm, pulling it up just to the edge of tearing the tendons. He gasped with pain and surprise.