"I am prepared to die for my wallet -- are you ?"
So true, not only about martial arts but life in general. Everything has a price, so are you prepared to pay it? Not only did Abbe sensei manage the situation, but he also gave the hoodlums a valuable lesson.
By the way, I have a friend who is a prominent medalist in several martial art championships. At a bar, someone wanted to fight him. "I'll do that," he said, "but first, google my name." The other guy was confused, walked away for a moment and did so. Then he came back, pale faced, and offered my friend free beer all the evening. That's damn cool , too