I dont know if he was really american or just said so, he spoke fluent german. But I vaguely remember that I was very very drunk and he said Im from America, I got really rage I dont know why and slapped him but only once and I was exhausted (Im weak and such). He didnt had any harm like blood or broken something just a slap. But still Im very sorry and apologise. I shouted then "Austria" dont know why, I was very drunk.