That literally gave a German gangster a legit excuse for killing a police officer (really, really rare over here that policemen get shot, really rare) when police stormed his house early morning and forgot to call out their profession. He shot one of them as he thought they were from an enemy gangster gang (those gangsters have stressful lives, don’t they).

German court acquitted him due to justifiable self protection.

The article above says the man was in his front yard and began firing on the marshalls as they approached.

I suspect that even if they did not announce their presence, their presence was known to him.

Some of the officers who rushed to the Charlotte neighborhood to rescue the first wave of downed officers were wounded as a second shooter began firing on them after they killed the wanted man,

Given that they would have been arriving in police cars, with lights and sirens, I’m pretty sure the shooter knew.