"It's a tradition in my homeland to give a gift of silver for significant achievements, happy occasions, and farewells. You were the first person I met from this world, and you helped me onto my feet. Please accept this coin as a gift."

He holds out a perfectly circular shiny silver coin with an intricate etched pattern of swirls that is not in common use anywhere in the country.

He gives a little bow. "Fare well in all your days."

He takes the train to his industrial complex, musing. The world is changing, because of him. Rapid change will start a revolution. Violence, maybe. But he kept the technologies he shared as safe as he could. They'll just have to deal with the rest.

He finalizes a series of ownership transfers, giving control of various industries to the best and brightest of his employees.

He boards his private jumpship and blasts into the upper atmosphere.

There is a brilliantly bright flash of light, and Nick is gone from the world.