I meditate to regain my mana before casting Lvl. 8 Protest of the Infinite.
Neither of you have a chance. I employ my DemocraticUnderground Screech of Hatred (pp 32, Players Handbook under Magic Users level 12 spells) and drown out both of your spells.
You also take 5x d12 of damage, unless you Save Versus Liberalism.