He didn't have to go all the way to the other side of the country to get his powers back. As he was leaving the hospital he was slowly regaining them, and that was only like 500 feet away from her hospital bed. I think, like Lenny has said, they have to be in direct, physical contact rather than just being in the same city to lose their powers.
So why did he have to leave his home in the city to go all of the way to the other side of the country?
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