Translation of erschallen

A bystander who watched the entire scene all the time decided to help me. He was an older man, around seventy, but nonetheless he went to the oldest of these kids and slapped him. The boy was sixteen.
While time is a great healer, it is very difficult and not necessarily advisable for a country to forget its past, therefore history always keeps the tensions to others alive. I will explain.
Eating in that Sushi place was fan as everybody was greeted loudly whenever entering the restaurant. The quality of the Sushi was not the best, it was a fast food place, but we really enjoyed it.