Question about Harry's scar

[grace701]

No: HPFGUIDX 53921

I was thinking of how Voldemort used the Killing Curse to try to 
kill Harry.  If I'm not mistaken, in order for you to kill someone, 
your wand must be pointed at their heart.  So when Voldemort used 
the curse, it rebounded and landed on Voldemort instead.  Now if it 
rebounded, why does Harry have a scar on his forehead instead of his 
chest?  I know I may be reading too much in between the lines, but 
could there be another reason as to how Harry got that lightning 
scar?  

Correct me if I'm wrong about the wand having to be pointed at the 
person's heart.


Greicy