It would have been impossible for Uall to move 20,000 miles conventionally overnight without anyone noticing how fast they were moving. It seems earth magic is forming its own team to fight back.
In reality, such a relationship would be impossible to hide in a royal palace. The lives of princes and kings weren't private. There were too many servanta and courtiers.
We must keep in mind the concept of the innocence of childhood is relatively new, it only dates to the 19th century. Children were property and had no real rights.
I'd say Henry's punishment was indeed quite severe. The world outside of court isn't a pleasant place, and his ashen pallor shows he's likely aware of the hard life ahead of him.
Some things are simple and others are hard. They are on their first uncertain steps to become kings. What an ungrateful lot of nobles they are saddled with.
Other attacks on large cities should have been expected. I'm surprised they waited this long.. By the evidence of the crashed ship, someone is fighting back.