(*Disclaimer: I've never actually seen this movie so bear with me.)
Two guys are fighting in this futuristic world, where swords are made of lasers and they're fighting to the death because one is really evil and the other is good. This happens. The evil dude is wearing a black suit with a funky black respirator type helmet. Some stuff happens and the good guys is all like "you killed my dad!" to the evil dude (major paraphrasing here). The evil guy replies. "No, I am your father...you know what forget it."
Now you can have twists in a story, which are like secrets but not really. The difference between a secret and a twist is that a secret is something nobody knows. Whereas a twist is a plausible end, road less traveled that people ignore until they can't ignore it any longer. i.e. a twist is always there, your job is to make it so people never think about it until you want them to.
"Oh! how did that happen?" and then as they look back on all the events leading up to the twist.
"OMG why didn't I see this coming?"
Whereas if you tell someone a secret, their reaction will be:
"I'll take your word for it."
As there is nothing to look back on to support this new information because it was a secret.
How this helps
Xoxo