It's a credit to how much Ishiah has adapted that he can consider Buffy's question without the brief, existential crisis he had faced shortly after arriving on the island. Robin had, ultimately, been the one who fared worse with the adjustment, but Ishiah had his own doubts as well, particularly after the puck left. The unique aspect of being a peri was that all of the choices were granted by free will, that he didn't have to credit any physical changes or irreversible decisions for differences in his behavior. Now that he's human and has to face morality, Ishiah wonders if his choices are colored by necessity. Wonders if that's just a part of being human.

There's no textbook for that type of thing.

"I don't know whether or not being human can be credited," Ishiah answers honestly. "I don't know what type of difference being human has made in specific. I do know that becoming peri granted me that free will, and with it, grays and colors became more clear. If anything, however, I feel that being human limits that view. There are some decisions one simply can't make. And others one is forced into."