A simple-minded question

[potioncat]

No: HPFGUIDX 95015

xNeri wrote: 
However  (again), doesn't Snape owe a debt for Harry because future!
Harry saved Snape (together with Harry himself, Ron and Hermione) 
from the dementors in PoA? It doesn't seem likely that the dementors 
would  have kissed the kids but spare Snape only because he was 
stunned. Of  course, Snape doesn't know it was Harry who saved him 
(unless DD told  him later), so this whole debt thing becomes even 
more complicated. 
> I'd rather see it as if both Snape and Harry owing each other a 
debt 
> that can never be repayed.
> 

Potioncat:
I noticed in a brief review of occlumency lessons (looking for a 
different set of facts) that scenes of the dementors comes up a 
lot.  Snape may learn about it from Harry himself.