Bah...wrong thread...sorry!

Let me just say I am glad the Original Poster Posted the example of combat.

Let me also say that two groups of players can run the same scene, and come up with different actions/outcomes.

Let me also say that two GM's will rule differently on actions, and use the rules in different ways.

Now let me say, if both groups had fun.  The GM's and Players did it right.

I just hope all these discussions about rulings, and meanings, are not happening around the table. 

Afterwords, okay.  During, NOT okay.  Everyone is there to have fun, not rules lawyer.

I couldn't agree more.  If in doubt, I always go back to Rule 0.

I'd like to see more Social Consequences, myself, since I intend on using social conflicts a lot.  Stuff like EMBARRASSED, FAUX PAS, ON THE SPOT, TAKEN DOWN A NOTCH, SCANDALOUS SECRET EXPOSED, GOSSIP FODDER, MAKES CHILDREN CRY, NOT FIT FOR COMPANY, BLACKLISTED, WANTED DEAD OR DEAD, LOOKS LIKE A LOSER.

EGG ON MY FACE; YOU SAID WHAT?!; FOOT IN MOUTH; WALK A MILE IN THOSE SHOES; SCARLET LETTER;  BETTER YOU THAN ME; ROLLS DOWNHILL; CAT GOT YOUR TONGUE

Just to name few...

If you word it this way you are clearly right.
I stand corrected.
I think it's a bit confusing that the players couldn't tag Voldys Shattered Rips. I can imagine that my players will complain about that.

They could tag the consequence...but it would be a +2 to a roll or a reroll.  If they wanted to make him collapse, they could still...potentially...do it but it would be treated as a compel and cost the players 1 (or more) fate points, which Voldy would get.  It's a give and take that also protects them from it happening to them, as well.

So a block against movement prevents you from doing anything physical even a wizard casting spells?

I think that would depend on the block.  If it were a lasso roped around your legs, then likely no.  If it were a series of mystical bands that have you wrapped up good and tight, then maybe...although I don't think it's absolutely necessary to have gestures with spellcasting...although I am sure it helps with "targeting", focus, and a dozen other things.  I could easily see a GM still allowing it, but upping the difficulty by two points or so (simply inverting the benefit from an invoke is handy, but also more of a houserule...I think).

+2 to a roll, or a reroll, as an invoke (or a tag, which is a free invoke) is not the same as denying an action (such as falling down, which denied movement, in this case).  That is the realm of compels.  At least as I see them.

Having run a game for 9, my first tip would be to keep the power level under control (unless you're wanting a very high-powered game, of course).  It will already be difficult providing steady and exciting challenges to that many players, as is.  Going at fully immersed levels will only add to that challenge.

Second, your biggest obstacle will be in making sure everyone has some means of contributing.  Typical combats will be over very quickly, so I would suggest "thinking outside the box".  Make sure there are social situations and mental challenges to encourage things beyond a group of 10 combat hounds.

FATE works well with large groups due to the simplicity of the base system and the cooperative narrative, though, so I think you'll be pleasantly surprised with how easily things flow. 

I would also encourage the group to really embrace the cooperative narrative; you might find yourself with an evening of game play where you, as the GM, pretty much get to sit back and watch while the players compel and instigate amongst themselves.