Why would a teacher/tutor/professor be nervous around their students?

He’s much older than me but his hands were shaking when he saw me outside of lessons and he seemed very nervous… he also seemed quite low the other day but as soon as I asked him if he’s ok, he cheered up instantly.

Social anxiety
They might fancy that student
Other
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+1 y
He’s been doing his job for 20 years so I doubt he’s inexperienced
Why would a teacher/tutor/professor be nervous around their students?
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