Prophecy fullfilment in SS?

[meriaugust]

No: HPFGUIDX 98501

Hey all, 
Have just been reading my copy of SS and am at the part in Chap. 17, 
The Man With Two Faces, in the Hospital Wing when Harry and DD are 
talking to one another, after Harry has fended off LV and Quirrell, 
and I quote: 

DD: I arrived just in time to pull Quirrell off you...I feared I 
might be too late. 
Harry: You nearly were, I couldn't have kept him off the Stone much 
longer-" 
DD: Not the Stone, boy, you - the effort involved nearly killed you. 
For one terrible moment there, I was afraid it had. 
(Page 297, American hardcover)

Here's my question, if Harry had been killed by Quirrell there, 
would this have been counted as fullfilment of the prophecy? If only 
Harry can defeat LV, then is LV the only one who can kill Harry? 
Would Quirrell have been able to kill Harry? Any thoughts? 

Meri - hoping she isn't repeating a much more intellegent post...but 
the search function again has turned up nothing...