Dragons are ostensibly overgrown lizards, right? Sure, they're bigger and scarier, but it's tough to deny that "reptilian" is pretty much the basis for their overall physiognomy.
Except that reptiles are cold-blooded.
Snakes have scales. Fish have scales. Both are exothermic, neither walk on legs, both move with a side-to-side motion. Ergo, using the above logic, snakes must be able to breathe under water.
Dragons are not reptilian, and via all lore I've read (from many cultures) I've yet to run across any that displayed non-endothermic characteristics.
To the grip-list at hand I add the following: It's cool that NPCs tell me things about themselves but you'd think they'd stop saying the same damned sentence after the 7th time in a row, in the last 30 seconds, and have seemingly no
short chit-chat dialog. I think it would be great to hire an amateur writer for an afternoon or two to do basic character design and realistic dialog -- and I say amateur just to highlight how bloody bad Bethy is at doing it.