The Ring of Apophis was a miraculous Numen, but no matter how amazing a Numen was, they all had one flaw or another! One such flaw of a Numen like the Ring of Apophis, according to Lambard, was that the illusion didn't work before the Head of Churches because they had their souls bound with the Grimoires!
Gabriel didn't want Elora to see him here as she was definitely going to get suspicious. There was no way she would've forgotten seeing him in the Castle of Lambard with Lira! Moreover, it was also possible that she blamed him for the death of her Head Priestess! Under no situation could he allow her to see him, even by accident!
Moreover, as the carriages got closer, he felt that familiar aura once again! He was sure that Elora was actually inside one of those Carriages! The Head of the Church of Water was here?