Snake Island sounds absolutely amazing and he's here for it. Which might be why when Popp realizes where they're headed and reacts with .. shock or alarm or is that fear, Sephiroth just tilts a little to look as forward out the windows as he can.

"Do you suppose there's actually snakes, or is it shaped that way?" He's never been there so he's interested in finding out.

This may go badly, neither of them are immune to venoms and poisons anymore.