How did Misha escape Buffo?

Misha's shoe was loose.... he managed to wriggle out of it and escape.

His meaty hands gripped my shoulders. I was dizzy with mint. My nose sank into his belly. And suddenly I was loose. I had yanked
myself out of the shoe he had pinned to the ground, and now I was running, bouncing off people. When it was safe to stop, I sat on a curb. I had foiled Buffo again. I was alive. I took the other shoe off and threw it away. It was spring. When the cold came back, I would steal another pair.