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Lex: Aren't you going to ask about Dominic? He hasn't checked in for hours, has he?
Unusual for a man of his tediously predictable nature. Go ahead. Pop the trunk.

Lionel:(before opening the trunk) Lex. What has he done? What has he done? To deserve this?

Dominic: Ah!

Lex: You want to ask an accounting question, Dad? Call me. A
nd the next time one of your drones bother the Kents,
he'll be lucky to catch a ride home with the spare.
If he rides with the spare tyre? Meaning in the same trunk?
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he'll be lucky to catch a ride home with the spare.

If he rides with the spare tyre? Meaning in the same trunk?

Yes, and most likely with far less air inside him than in the spare tire.
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Thanks, Philip, but what about the first line:
What has he done? What has he done?
He says, "what has he done?" after popping the trunk. Is there something in the trunk that elicits this question? If it's a body, "what has he done?" would be just a question of wonderment: what is happening, what has happened, what does this mean, why did he do this, etc.
No, you've got me wrong, Philip. He says 'Ah, Lex, what has he done? What has he done?'
But he says it before popping the trunk. After he pops it he sees he's faithful servant laying inside.
Lex tells Lionel (his father) next time to call him and ask him himself for financial matters not to send
his servants to investigate. After that Lionel says 'Lex, well done!'
So, now having the full context what does the underlined mean?
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