Mother dragon has babies she leaves them just for they food and when she comes back a knight kills them the mother is heartbroken and the knight is king
King not kind on any of those* you can only be kind if you have royal blood in you if you don't have royal blood in you you can't be king (this was me being smart but again awesome animation)
This is an amazing story btw but even if dragons were real and he killed her babies it wouldn't make him king cause 1. Baby dragons are almost harmless 2.its the mother that they need to kill if that was a case to be kind and 3. You can only be kind with