Where's that Big Reveal in DH?

[Catlady (Rita Prince Winston)]

No: HPFGUIDX 180033

Hagrid <aussie_lol at ...> wrote in
<http://groups.yahoo.com/group/HPforGrownups/message/180030>:
>
> aussie:
> From Good to Bad
> - Stan Shunpike

What's the evidence that Stan Shunpike was Bad? I, like Harry, thought
he was under Imperius when he was chasing Harry. If Harry had thought
that Stan had taken the Dark Mark under his volition, he wouldn't have
been so careful to spare his life.