Defense of knee in the stomach. My hand here is going to grab his belt and I'm going to make a fist. I'm going to punch into his stomach and get my hips out. I'm onto my elbow, my legs come like so, come to my knee here, grab his ankle yank it out from under him.
Knee in the belly, I grab at his mid-section, grab his belt and now I am going to punch into his stomach and escape my hips. Come to my knee, grab his ankle, the closer ankle, and yank it out. That is your escape from knee in the belly.