Snape's AK

[strawberryshaunie]

No: HPFGUIDX 140610

Pippin said:
"If [harry] knows more, if he knows for certain than the
killing curse can throw a living target into the air,
or that the body can assume a peaceful expression or bleed
after death, then JKR is cheating. So far she has been
very careful not to cheat, even to the point of admitting
unintentional red herrings."

I noticed something while reading CoS that doesn't seem to have been 
pointed out. In the duelling Club scene, Snape uses Expelliarmus on 
Lockhart, *blasting him off his feet* (and into the air, slamming him 
into a tapestry or some such, if I'm remembering correctly). At the 
time, it seemed a demonstration of Snape's power: it seems a mere 
disarming spell, performed with enough drive, perhaps enough magical 
power behind it is enough to blast a foe away. This is almost exactly 
like Snape's AK in the tower situation. I think this is evidence that 
the AK was legit. A spell can produce extra effects, whether it's 
because of the magical power of the spell caster, or the level of 
concentration on the three D's or some other side effect that has yet 
to be explained.