In Latin it's somewhat usual to use the past perfect of "to live" to indicate that someone has died. In Dido's last speech in the Aeneid, before committing sui

In Latin it's somewhat usual to use the past perfect of "to live" to indicate that someone has died. In Dido's last speech in the Aeneid, before committing suicide, one of the things she says is "vixi" ("I have lived"). Cicero is also known to have used "vixerunt" ("they have lived") as a euphemism for reporting on how he had people executed. https://en.wiktionary.org/wiki/vixerunt https://en.wiktionary.org/wiki/vixerunt So maybe this is a classicism in French, or maybe the author just thought of it spontaneously. Latin also has a future perfect like this ("vixero", "I will have lived"), but I can't think of an example of people using it to talk about imminent deaths.