I think this can fit in this section... But I could be wrong.

When Heather was stuck in the mound's entrance, she thought she saw pity on Redeye's face.

So I'm going to overanalyze it.

We don't know much about Redeye's life before the Green Ember, but I have a feeling it wasn't too happy. Here's why:

1) His Father

We know his father was evil and what naught, so he probably wasn't the easiest person to live with.

2) His Mother

Non-existant. Probably dead. Maybe when Redeye was young. Maybe killed by rabbits like his father. Maybe that's why he hates them so much.

3) Him

His attitude makes me think he's out for revenge. It doesn't justify anything, but come on.

And to why he could have pitied Heather, and only for a second?

Here's my theory:

When Redeye was young, his mother, and possibly siblings, were killed when his father was out fighting. He was almost killed himself but narrowly escaped. That's why he pitied Heather. Because she was in the same situation he was once in.

But his vow of revenge to all rabbit kind, made that pity last only for a second.

This is based on a lot of maybes. So many that Good Ol' Master Smith probably doesn't have a tad bit of this in mind.

But I like to think that there's an in-depth story/plight to each character, including villains.

Can't even guess Morbin's though.