You understand he isnt going straight for five miles, taking a right and going five miles and then taking another right and going five miles.
The northernmost point you can get to is the north pole
If you start at the north pole and go south
Then go west
Then go north
You end up at the north pole again.
You might be facing a different direction
But you always will end up at the north pole again.
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If he goes straight 5 miles, then right 5 miles, the walk back to his house won't be 5 miles