Who is responsible for the round (warning shot) when it kills or seriously injures another completely oblivious person?
Answer: Whoever pulled the trigger (you).
In some locales, the perpetrator of the original crime will be charged. For example, somebody comes into your home and kills your wife. You chase him out and fire a warning shot and he stops and goes to ground (God knows why
) You find out later that your warning shot kills an innocent bystander. This all comes out under investigation. He is charged with both killings.
not advocating warning shots; my opinion is in fact the opposite. But, this is a possibility in certain locations where people are obviously sick of the "criminal justice system," and their legislators have listened.