Sword is a horcrux

[hamstermap]

No: HPFGUIDX 146552

I don't remember but should go back through but others say that 
when he attempted for a Hogwarts job for a 2nd time that as he 
left he made a motion of his hand. What if before the "interview" 
he had killed someone and as he left he used the horcrux "spell" 
or whatever it was, only nonverbally I'm just assuming, and if he 
did he knows it's in a safe place because all of the headmasters 
would protect it.  So, it would be a perfect place for it.

"hamstermap"