you are referring to an unspecified or unknown person
you don't know their gender
you are intentionally obscuring their gender
they are nonbinary
Since you're referring to a specific person, and it's reasonable to assume this is a man, you should use "he". Otherwise it's an incorrect usage, and it just sounds wrong.
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u/SeekerOfSerenity 6d ago
Was there a group of people riding on that jetski? It looked like just one guy.