As i see today, going first in a pvp match can be a huge advantage(unexpected shields and dispels).
There should be an order of who gets to use their spell first.
1-Healing: so that a player gets a chance to withstand an attack 2-Attacking: to attack with getting any surprises 3-Shields and weaknesses(power nova effect, efreet effect, etc.) 4-Dispels: so that no one loses a great amount of pips from trying to attack unexpectedly.
All stuns should resolve in the next upcoming round.
If a player gets defeated, he/she should at least get the chance to cast the spell that they used on that turn.
If a whole round were to go in this order, it would make the match completely fair. :D