Why would horses, especially king's horses, care about putting an egg back together?... again.
I'm not entirely sure I get it. First of all, a horse doesn't have the biological tools to put the egg back together. Hooves don't have fingers, let alone opposable thumbs, so wouldn't that just do more harm to the shell? I suppose the horse could try to push the egg together with it's nose, but wouldn't it be too tempted to just eat the yoke instead of trying to put it back in the shell? And, if it's a king's horse, shouldn't it be in a nice warm stable being spoiled with sugar cubes, or off aiding a heroic knight on his quest for heroism?
What was Humpty doing on a wall anyway? If you're an egg, you're not exactly known for your balance, so why would you put yourself in a position where lack of balance could be fatal? How would an egg even get on top of a wall, it doesn't have arms or legs to climb. I think there's something very shady about this whole story.