How would Harry have killed Sirius in PoA?

[Kelly L. <kethlenda@yahoo.com>]

No: HPFGUIDX 49732

Alexander wrote:

 Well, when I was 13 and went to school, I could definitely
> *not* make a machine-gun. Still, I knew enough to make a
> good sharp dagger. Similarly, I lacked knowledge to make a
> proper dynamite, but I knew enough to make trinitroglycerine
> (or how it is called in English, dammit ;). So while 13 year
> old Harry doesn't know Avada Kedavra, it doesn't mean he
> knows *no* spells that could kill a person... especially a
> wandless and defenceless (as Harry thought ;) person.

Me:
And it's even possible that Harry had at least heard of AK.  
Hermione knew of it, and knew that it was one of the three 
Unforgivables.  Admittedly, Hermione usually knows more 
history, etc., than the others.  But it's possible that Harry had 
heard of a curse that killed people and was willing to make an 
attempt to cast it.  We don't know that he had never heard of it 
before the DADA class in GoF, we just know that he didn't realize 
his parents had been killed with it.

Kelly L.