I am as much a writer as I am a commentator and reviewer, so let me introduce a literary concept to all my fellow GA Authors.

Chekhov's Gun is an allusion to the famous short story author, Anton Chekhov of the early 20th Century. and his idea of utilitarian story elements. He proposed that if a gun were hanging on a main character's wall in the 1st chapter of a story, then it must follow that the gun would go off eventually in a later chapter. If the gun never goes off, then the writer should not have hung a gun on the wall.

Some people associate the idea with foreshadowing, but there is a very big difference. The gun has always hung on the wall, because the character has an intent to use it. Foreshadowing can be done by ideas without direct correlation to the character; i.e. you allude that Othello has a bad temper and is prone to misjudgments, he would later kill his girlfriend due to anger over false infidelity from Iago. That's foreshadowing a tragic ending.

A Chekhov gun example would be like, Harry Potter mention he had to face Voldemort in the same forest where he threw away the Philosopher stone in book 1. Ergo, he will die and be resurrected (Christian symbolism too) by the Philosopher stone.

Hope writers enjoyed this little tidbit of fun facts and examples