They're the ones who look at YOUR shoes when they talk to you.
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Introverted Engineer looks at His shoes when he's talking to you. Extroverted Engineer looks at Your shoes when he's talking to you.
An introverted engineer looks at his feet when he talks to you. An extroverted engineer looks at YOUR feet when he talks to you!
They look at your feet instead of theirs.
He's the one staring at YOUR feet when he talks
He's staring at somebody else's shoes.