Lily's sacrifice and potection

[moony_loony at yahoo.com]

No: HPFGUIDX 192620

Lily sacrificed herself in order to protect Harry. Because of this sacrifice Voldemort was unable to kill Harry, the AK curse rebounded and Voldemort's body was destroyed.  Recently I realized that there is someone else who sacrificed himself to protect someone loved--I'm speaking of James. James sacrificed himself to protect Lily and Harry.
 What is the difference between James' sacrifice and the sacrifice of Lily (and in book seven Harry)? All three died to protect someone--they selflessly sacrificed themselves because of love, but only Lily's and Harry's sacrifice resulted in some sort of protection (Lily's sacrifice protected Harry and Harry's sacrifice protected the students and teachers in Hogwarts). 
 Why? Where is the difference? There must have been others, too, that sacrificed themselves for their loved ones. Mothers like Lily that died to protect their children during the First Rise of Voldemort. 
 How does this magic work and why can only some trigger the protection?

 moony_loony



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