That fucker looks like he's the type to enjoy watching/taking part in the "watersports" fetish. He probably went home after his shift and masterbated to the video he recorded.

Americanized form of jewish (ashkenazic) Grün (see Gruen 2) or Grin, artificial names meaning ‘green’ in German and yiddish

https://discover.23andme.com/last-name/Green