A huge famous powerful wizard had a feeling about him. And had visions about him, and had talked about him to Hecate (see he knew Merlin musta remembered him) and Kaden didn't think he could live with himself if he didn't rise to meet all that. The thought of seeing disappointment in Merlin's face was actually crushing.
But oh god oh god oh god. "Y'know if, uh, Ares or Apollo find out I'm still alive I'm fucked, right?" he asked, with a glance over at Merlin. Just how big a gun was he, big enough to stand against Olympians? Would he, even? Just because he'd helped turn Kaden back didn't mean Kaden thought he'd put his neck on the line for him or anything.