Quote Originally Posted by Scowling Dragon View Post
Except there is that whole "Blood Drinking" thing.

Why did Kanya not know about this? Why did hussie need this to be a mystery of nothing of important was revealed?

Why don't they have night vision instead of a predator attracting glow?

Because it probably wasn't thought through very well, but it sounded cool so "Why not?".
Kanaya didn't know about the specifics of Rainbow drinkers because Limebloods are very, very rare. So no one was there to tell her about it.