Snape-AK-dueling club

[agdisney]

No: HPFGUIDX 142120

We keep wondering about the AK at the tower.  To be more specific, why 
was it so much *stronger/different* then other AK's that we've seen.  
Why did DD fly into the air?
Reading COS regarding the dueling club, Scholastic pg 190 where Snape & 
Lockhart are preparing to duel:  "Both of them swung their wands above 
their heads & pointed them at their opponent; Snape 
cried: "Expelliarmus!" ...Lockhard was blasted off his feet.  He flew 
backward off the stage, smashed into the wall & slid down it to sprawl 
on the floor."  Isn't this what happened to DD (without having a wall 
behind him)?
Maybe this is just the power the Snape is able to achieve when he 
performs jinxes/curses on someone he despises.
I'm finding more clues in COS in this reading then ever before.
Thanks for listening.

agdisney