Jury Duty

So I just finished serving on my first jury. The trial is over so I can finally talk about it.

The charges were battery with serious bodily injury. It involved an altercation in Isla Vista on a Saturday night where one guy punched another guy in the mouth, knocking him to the ground and knocking out 2 of his teeth.
The jury could not come to a verdict and they had to declare a mistrial.

The big sticking point was whether it was self defense or not.

I'm not sure how I feel about the whole thing. I'm incredibly frustrated