Saf is thinking that Crystal want's to make sure that Zein or even Minatzul, possibly both, don't find out that Saf is now a shape-shifter. Ah, the power of Gene-319. Oh, and yes, the powers they gain from it are permanent, so Safudor is now a Shape-Shifter in the same sense that Crystal is. BUT, he can't just shape-shift willy nilly like Crystal can, He'll have to use it some more, so that he can use it more at a time.