Questions arising from the Duelling Competition Threads - for sports duelling

Note: Characters with a number of classes will participate. So far we have had - Fighter, Swordlord(prc), Rogue, Paladin, Cavalier, Bard & Magus participate.

1. Duelling Table = 15×15
2. Duellists must start in opposite corners
3. participants must be 'magic free' when they enter the table
4. No external assistance is permitted.
5. Weapons permitted - Light Blades, Duelling Sword, Falcata
6. Weapons are MW and made of blunted steel (they do 50% Lethal and 50% non-lethal damage)
7. Because weapons are blunted - precision damage is halved.
8. Armour permitted - None
9. Shields permitted - Buckler
10. Initiative will be rolled for each round.
11. Participants must submit one set of instructions rep combat round. They may not submit either/or instructions.
12. Participants may hold their action, and concede initiative (for that round) to their opponent.

? Etiquette says you do not use spells or abilities that reduce your opponents ability to fight.
? Etiquette says you do not use abilities or techniques to disarm your opponent.
? What type of spells should caster's be able to use?
? What class abilities?