Quote Originally Posted by MFauli
Maybe that. My first thought was that, because there was at least one weirdly "intimate" moment of the Hydra staring at Rudy, that it is so powerful and thus so close to the Dragon God that his eye powers don't work on it. Similarily to how I imagine they wouldn't work against the Dragon God or probably any "God".
Rudy's eye didn't stop working because he got close.

He just celebrated early, then lost his shit when the dragon was in his face. He wasn't actually kidding when he told Roxy that he gets scared (easily). He's quite calm at times, but when danger is rammed right up his ass he too loses his shit.