Its just hard to imagine at this point with bernhard.Not only do I not recall Indra being eaten, even if he had been, no monster is going to raise a hand against the Eye. It's like God visiting a hyper devout christian and saying:"yo I need your body for a manifestation, k?". Absolutely none of his followers are going to object.
It's gonna be a good fight and narratively speaking I think Indra will gank one of the three. We need a "shit's real" moment in the story and the best way to do that is to kill one of chars that we thought of as nearly invincible.
Sylla was able to put up somewhat of a fight against Indra while Bernhard steamrolled the eye, but powerwise comparable (not entirely sure?) beings to sylla like eis...-whats her name? The one he captured.
But yeah narratively it would make sense for indra to be stronger than the three, otherwise ... what are the monsters gonna do?