walking, depending on the angle at which one is stuck, does not work.
I have used fiberglass, plastic, and carbon fiber at different times over many years for push offs.
I had a fiberglass blade get a chip broken out of it and a carbon fiber which showed a bit of chipping on the end of the blade. Overall, they all worked fine.
Fortunately, I have a friend that repaired both for me. We're much more careful now.