For a native Spanish speaker, the genius lies in the nuances—the way a pause before a name changes its meaning, the grammatical gender of a past participle that gives away a hidden identity. For a Vietnamese subtitle creator, this was a war on two fronts: speed and deception.

They are the reason why, in Vietnam, the name "Mario Casas" might not ring a bell, but the phrase "Bà già đó là ai?" ("Who is that old woman?") still sends chills down the spine of a generation of digital natives.

If they used the wrong pronoun, they would spoil the film’s earth-shattering reveal 20 minutes early.