Lots of good suggestions. Thanks. I will look for a new self defense class.

The mugger told me to throw the bills from my wallet onto the ground. Then he stepped on the bills to secure them. That's when I ran away. I asked the police why he did this, and I was told that the mugger probably didn't want me to hand him the money because if I were close enough to hand it to him, I'd be close enough to strike him.