Translation of entkorken

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.
A good friend of mine. He works currently in NY but is a Swiss lawyer, excellent and very intelligent. Shall I ask him? OK, sounds great. Maybe we can add his words and expressions (from the law field) as well.
You may have seen our Language-School book section where we have descriptions of over 120 language schools world wide. Do you have a program for foreign students? If so, it may be very interesting.