Those questions did not have to be answered, al least not then. He should have simply admitted firing the shots and refused to say anything more until he obtained an attorney and consulted with that attorney. That’s particularly true here where he apparently fired multiple times after the threats apparently ended and killed both perps. In any case like that the the homeowner is at risk of some serious charges and needs to consult an attorney before saying anything to the cops.
Bingo. His only problem is that he said too much.
Yeh but he was just dying to answer them, particularly the question on why he didn't call the police after he shot them.