Interesting video! The snake seems to be conveying that it does not want to bite him. It clearly gives plenty of warning.
Even the snake you had suddenly stepped on (egads!) just wanted to get away. They do not want to do harm to anything.
Good stuff to know.
I think they don't wake up in the morning and say to themselves, I wonder how many humans I can kill today. They're more intent on eating I guess, and reproduction. The Eastern Brown will not attack, it's a more defensive stance really, but they will aggressively defend and that means a bite, which kills most often than not.
They have a fairly good tolerance as you may have seen in the video. They are happy to posture and give some warning. That's when it's prudent to stay still, back away very slowly. The snake is most likely to do the same.