There's a few different directions I can think of that you could go:
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The consummate professional. He doesn't particularly care about his reputation, but the idea of not being allowed to work in the field anymore is why he's ok with it. Calm, collected and well-spoken.
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The craven. Scared of the punishment for the lab blowing up and knowing that he's going to take the fall, he wants to avoid the corporate retribution. Jittery, anxious and nervous.
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The family man. Maybe he thinks that post-extraction, he'll be in a better position to help his son. Empathetic, polite and helpful.
There's obviously many more ways to think about a character in his position, but these are the ones that immediately sprung to mind for me.