Serious threat or not, he was a threat who was shooting (if the reports are correct) toward the shoreline.  He could have come out unarmed but chose not to (if the reports are correct).

I don't see why the reports would not be correct in this case.  It's a sad outcome, but this is why we pay our police -- to deal with tragic situations.

We should always question our public servants who work for us and hold a high standard for those we employ and equip with weapons.  In this case, it seems to me, this was a job well done by our law enforcement despite the unfortunate ending.