I did a search, and I know there's plenty of photos around but I'm still a little confused... I'm wondering, how exactly do these legs work? What keeps the dolls from falling flat on their faces? The knee joint looks normal enough from the photos, but the joint below it is basically a backward knee that, even at the standard standing upright pose, looks terribly bent. If my regular dolls had their knees bent at such an angle, they'd just fall over. How about when they're crouched down? I assume the dolls are pretty heavy so how does that work? My normal SD10 can't even crouch without her sockets popping. Also, are the legs strung all the way through from head to foot or do they attach only at the knee? Thanks so much... any pictures with descriptions/explanations would be much appreciated !