The best reason for Dumbledore to trust Snape (Lily?)

[lagattalucianese]

No: HPFGUIDX 137893

> 
> CathyD:
> Sorry, I had to snip your whole post to get to this.  Harry didn't 
> kill Quirrell. Voldemort did.  Quirrell was still alive and fighting 
> Harry for the Stone when Dumbledore arrived.
> 
Gatta:

The book doesn't really make it clear what happened. The impression I
got was that Quirrel died of contact with Harry, sort of passive
killing but killing nonetheless. In any case, we end up with a live
Harry and a dead Quirrel, which in most circumstances would take some
explaining ("I dunno, officer, he just sort of evilled to death...").

(Isn't "Quirrel" a wonderful name! Anyone who's ever seen a mad
squirrel will know exactly what he looks like.)