Since Rei is a clone of Lilith shouldn't something really bad have happened when Zeruel ate her in Rebuild?
Oh god it's horrible
Why, internet? Why?
Rei's body is a clone of Yui, but it was an empty shell without a soul. Lillith's soul inhabits it. Different situation than a direct clone of Lillith.
Something bad does happen when Zeruel merges with Unit 01, which is a clone of Lillith.
Something changed, Anno hates Rei.
Is that supposed to be Arael on the left?
It has to be biological contact. Rei is physically Yui, but her soul is Lilith. If an Angel were to come into contact with Lilith's actual body, they could initiate Third Impact. It would sacrifice the Angel in the process, but it would also erase all of humanity so that the remaining Angels could reclaim the planet like they were supposed to.
Since Unit-01 is biologically Lilith, Near Third Impact began when the Angel Zeruel, who absorbed the soul of Lilith, came into contact with an Awakened Unit-01.