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The story shocked me more than usual because I know my buddy is a pretty good martial artist. He is often dubbed as 'talented' by his colleagues and superiors. What's wrong your story? In theory, he would have wasted the thief in no time while he clearly had no weapon with him. According to him, he couldn't know how to handle it. He knew how he could subdue such assault but he just couldn't know what to do immediately. Well there is a number of options starting from a simple rigged setup to a more official, albeit expensive, approach. If you use any of the methods below I definitely recommend taking extra precautions because music as we all know can be quite distracting during a motor vehicle so extra precautions needs to be taken during a bike. So knowing that let's take a review of our options: