A Simpler Scenario

[pippin_999]

It has dawned on me that if RAB did get into the
cave and tamper with the locket, it would be the
easiest thing in the world to tamper with the potion
too. Just a few drops of something lethal and thanks
to Golpalott's Third Law, Voldemort's previously
prepared antidote wouldn't do him any good at all.

RAB was, of course, wise enough not to brag about
this in his little billet doux. Finally, a DE who's
read the Evil Overlord's Manual! Pity that he didn't
know he was living in a book -- poison never gets
the person it was intended for.

I think it's already been mentioned that it's odd that
a blast in the chest would cause a body
leaning against a wall to travel upwards. And then
I realized that Dumbledore's fall off the tower reminded
me of something else.

HBP
A jet of green light shot from the end of Snape's
wand and hit Dumbledore squarely in the chest.
Harry's scream of horror never left him; silent and 
unmoving, he was forced to watch as Dumbledore was
blasted into the air. For a split second, he seemed
to hang suspended beneath the shining skull, and
then he fell slowly backward, like a great rag doll,
over the battlements and out of sight.

PS/SS
The club flew suddenly out of the troll's hand,
rose high, high up into the air, turned slowly over
--and dropped, with a sickening crack, onto its
owner's head.
---


So here's the *simple* Snape is innocent version:
Regulus poisoned the goo. Dumbledore drank it
and was dying by the time Snape reached him on 
top of the tower. Dumbledore pleaded with him
not to take any heroic  measures to save him.

Snape did a fake AK, and immediately afterward
a non-verbal wingardium leviosa. Dumbledore gave 
up the ghost, and Snape let the body fall from the 
tower so that the DE's, who are familiar with the way 
someone ought to look when they've been AK'd, 
would not get a chance to examine it.

Pippin