Originally Posted by WilliamR
The Director stated that Carl turned his head to expose his neck so his turned father could bite him to end it because he gave up and didn't want to go on anymore.
...and that's truly silly.
Zombies bite at whatever they get to first. In this case, his foot was that first thing.
A zombie isn't going to go "oh, look, he's presenting his throat to me - let me just mosey on up there and kill him quick..." Apparently the writers got confused and thought they were writing for a vampire show on the CW.
Carl has been around the block enough to know what it's like to die at the hands and teeth of a zombie. He may be a pain in the butt and a brat at times, but he's not naive enough to not realize how slow and painful his death would be had Rick really been coming to eat him foot first.
Actually, now that I think about it, with the quick about face Carl did from "I hate you, Dad, and I don't need you" to "I can't bear to go on" feels like they hired the writers from the Star Wars prequels.
"Oh, boo-hoo - the Jedi don't respect me. I'll show them by going all dark side..."