Sectumsempra inconsistancies.

[Chancie]

No: HPFGUIDX 173221

Why is it that in HBP, when Harry uses sectumsempra on Draco, Snape is able to repair the damage.  But in DH, when Snape uses it, and ends up cutting off George's (I can't get to my book right now, and can't remember for sure if it was Fred or George so sorry if I'm wrong) we are told that they wouldn't be able to fix his ear because it was Dark Magic.  Do you think it was just because they were unaware of the spell, and didn't now the counter spell for it, or did I miss something?
   
  Chancie

       
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