There are plenty of of spells, hexes, jinxes and curses in the wizarding world. They all have a particular nature, are designed for a particular purpose.
Similarly, they have their own colored jets of light.
My question regards the spell with which Bellatrix hit Sirius before he fell through the veil. It's red, and forceful enough to have him fall through the veil.
Do we have any proof, other than its color, that it was definitely a Stunning Spell?
If not, what could it be?
And while I'm at it, I would like to ask whether we are absolutely sure that Sirius died after passing through the veil, and not as the spell hit him. Stunning spells don't kill, but if it wasn't one, could it actualy have done so much damage to actually have killed him? In short: Did the passing though the veil take his life or the did the spell do the job?