Les ghouls pourrait être expliquer scientifiquement je ne verais pas pk. Si vous savez lire l´englais voici une définition du dictionnaire.
Definition: \Ghoul\, n. [Per. gh?l an imaginary sylvan demon, supposed to devour men and animals: cf. Ar. gh?l, F. goule.] An imaginary evil being among Eastern nations, indistinguishable from a human which was supposed to feed upon human bodies while in a catatonic state [Written also {ghole} . ]"
Now a Ghoul is similar to a Zombie but different. A ghoul posseses much more intelligence and is by no means dead. A Ghoul feeds on human flesh, but dead human flesh. Perhaps this is why the Ganado try to kill Leon as opposed to trying to bite him. Another aspect of the demo which supports this idea is Leons police escort cooking in the town square.
" Ghouls have relatively low intelligence but are capable of some articulated speech. They have a only a basic understanding of simple tools, and are fundamentally driven by their instincts and lust for food. They are primarily nocturnal, preferring the cover of night to satisfy their vast appetite for human flesh.
When discovered, they will usually hiss and growl to ward off intruders and, if that fails, they will attempt a quick escape. Ghouls will only fight if they are cornered, or if they outnumber the living by at least three to one odds. Single ghouls have been known to attack infants, children, and in rare cases - wounded or sickly adults."