Who stuns Sirius -- ESE!Lupin?

[scoutmom21113]

No: HPFGUIDX 111133

Bren:

I personally believe it has ESE!Lupin written all over it. I always 
found it curious how Lupin held Harry back from entering the veil 
himself.

Bookworm:
So if Sam fell of a cliff during a fight and Howard leaned over to 
try to stop him from falling, it is suspicious/evil for Larry to 
grab Howard before he fell over the cliff too?

This argument has never made any sense to me.

Bren:
Why did Sirius' eyes widen with shock as he died?

Bookworm:
"Come on, you can do better than that! Give it your best
shot....Oh, my god she did....."  Shock, as in cocky,
over-confident Sirius actually lost a fight against the cousin he 
hates.

CDR:
...if it really just is straight-forward Bella, JKR doesn't make it 
completely obvious by calling it "her second jet" instead of "the 
second jet" or something.

Bookworm:
It's just the way she phrased it.  For the same reason she
didn't show us Harry sneaking into the office to get the
Marauders' Map back – she didn't think it was necessary.

CDR:
I still feel the actual situation in the Chamber is very ambiguous, 
with that second red jet of light seeming to come out of nowhere.Do 
others feel the same?

Bookworm:
I'll agree that there is room for JKR to show us that something 
suspicious really did happen there.  I just haven't seen any 
convincing arguments for it yet. 

Ravenclaw Bookworm (who does not believe it was Lupin)