Umbagog: Voyeur

"I am made by God, thanks be to Him, such that your misery toucheth me not, nor doth the flame of this burning assail me."

Remember that Kit and Jade make-out session? [link]
Yeah. Froth was watching.

I don't think "obsessed" is the right word to describe how Froth feels towards Jade; I think "territorial" is closer, though not quite there, either. Froth regards Jade's impossible escape of him as divine intervention: the other side's hand. To what end he hasn't fathomed yet, but it's really bothering him. And since Froth's delusion makes him think he's a demon unleashed upon humanity, he's taken it as a personal challenge.

If another Half-Dead were discovered messing with Jade, Froth would take serious issue with it.

I also included what Froth's regular eye looks like. He's so often shown with his nictating membrane, which is glowy. So technically, in this picture, Froth is sort-of winking.