Ok, about Flambeau Tournament, Dimicatio, & Fast-Cast defense:
To win DImicatio you need to be the first to hit with a forcelessly cast spell. The refs use InVi to determine, so the spell need not be visible in any way?
To avoid getting hit by the enemy you need a fast-cast spell for defense, of apporpriate TeFo combo of at least half level of offensive spell. Does this require any specific parameters? D:Mom should be enough, but what Range? And T:Ind should be enough, but what if the attacking spell is T:Group? Or is it for simplicity just dependent on the totel level? After all if the attacking spell is T:Group it is already +2 mags, so the defense needs +1 mag compared to Individual.
Or you could use more general Vim spells, but need to match the level of the attacking spell.
What constitutes suitable TeFo combo?
For missile type spells this is easily seen, as Rego or Perdo for the relevant Form will work. Muto even. Or Creo combined with some Form sturdy enough to withstand the attack.
Also momentary invisibility or short teleport will remove a viable target for the attacker, right?
Less obvious are the indirect but physical spells. According to HoH:Soc Trap of the Entwining Vines, Weavers Trap of Webs and the like aren't resisted, since they don't immobilize caster merely prevent him from moving away. Although this does not sound like that in the spell descriptions!
But are these ones able to win Dimicatio?
And what will be suitable defenses against these again Pe, Re or even Mu Form? Can they be blocked by Creo Form?
What about other spells that alter the environment? A Pit of the Gaping Earth, that isn' cast at the magus so can this win Dimicatio? Seal the Earth, if the pile of dirt is targeted on the opponent?
How about Sling of Vilano, I et that spell won't work in Dimicatio? Since the concept is to not hurt the enemy. Same goes for other indirect, unresisted spells.
The less visible spells - both direct damage with PeCo but also Mentem, Imaginem and Vim effects seem less logical to determone how to defend against.
Is there any way for this except the harder Vim spells?
As for determining TeFo of attacker's spell, is this in any way dependent on Voice and Gestures used? Or is it simply a matter of recognizing the magicla energies forming? Otherwise people with Quiet-, Subtle Magic, or Deft Form or relevant Masteries will have a huge upper hand. And since Penetration does not matter in Dimicatio magi could even cast subtle and silent if they can only just pull the spell off.