I think it would be funny if someone's cat jumped on their keyboard while they are in a city and they end up killing a green player because the kitty hit their attack keybinds and then have to book it out of town because every guard and bounty hunter in the city will now be after them.
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What can I say. Your cat, your responsibility.
That is more than enough "free space" imo.
Learning to PvP in a young age already will be good for him.