Slytherin as villains / Ender vs. Harry SPOILERS for Ender's Game

[Carol]

No: HPFGUIDX 179055

 Betsy Hp:
> And he knows Draco *should* be there because all of the other 
Slytherins (of age or not, that's getting far too detailed for a JKR 
novel, frankly <g>) are with him.  Otherwise, why would Draco *not*
being there stand out?  <snip>

Carol responds:
Because Draco (alone of the Slytherins, so far as we know) is a Death
Eater (and LV would have no trouble recognizing him instantly). If
Draco has the Dark Mark, as seems likely, he would have been summoned
to join LV, and Voldemort would regard his absence as the disobedience
of an order. Of course Voldemort noticed his absence, just as he
noticed Snape's and Karkaroff's in the graveyard. (And *Harry* would
have noticed the *presence* of unhooded Slytherin students among the
Death Eaters had any been present.)

Carol, using her last post of the day to make this small but obvious point