The ritual to kidnap Ruby was supposed basically ONLY AFFECT RUBY without any interruptions. If that happened, Enzo would die die. This happened in novel, no interruptions, so... yeah.
In manhwa, Shitsare forcefully interrupted the ritual, unlike in novel. So, like what the Queen said, Enzo wouldn't die die, but instead be basically comatose, with side effects transferring to Shitsare because he interrupted it.

WAIT I thought Enzo was gonna die die?? what’s this?? I am happy that he will live but still someone explain