drop bear
Sr. Grandmaster
1. If you get stomped on your foot, it hurts a whole lot, even if you're wearing shoes. I know from experience.
2. A push kick in the knee side can damage it permanently. I read it in Martin Dougherty's book: 'How to defend yourself, unarmed combat skills that work'.
Also, to answer some other posts, just because it does not occur to many people to attack you there in a fight does not mean I want to rely on that.
A good stance will make that shot painful but manageable. From someone who does kick at knees and kicks at calves.
Nobody is getting that ankle sweep to work on you.