Maggie Stiefvater said this quote
“ There were many versions of Gansey, but this one had been rare since the introduction of Adam's taming presence. It was also Ronan's favorite. It was the opposite of Gansey's most public face, which was pure control enclosed in a paper-thin wrapper of academia. But this version of Gansey was Gansey the boy. This was the Gansey who bought the Camaro, the Gansey who asked Ronan to teach him to fight, the Gansey who contained every wild spark so that it wouldn't show up in other versions. Was it the shield beneath the lake that had unleashed it? Orla's orange bikini? The bashed-up remains of his rebuilt Henrietta and the fake IDs they'd returned to? Ronan didn't really care. All that mattered was that something had struck the match, and Gansey was burning. ”