Everyone likes to think they are a badass, but people rarely act the way they think they will. I had friends that caught a couple of thieves INSIDE their car coming back from the bar. Not only did they let them go, a girl was one of the perps, no one got even a little bit roughed up. From the sidelines it's hard to understand, but I suspect that's a pretty common result. Like the times my dog is actually successful at catching a squirrel, she has no idea what to do and it gets away unharmed.