Have Cyan (or Gogo) use his retort technique (his second one) and have someone quickly imp him. Kill him with a Doom or a powerful Physical attack (Can't be more than one). He will die. Revive him. The next time an enemy attacks, Cyan will counter...and counter...and counter....and counter....and counter.... and... well, basically, he will continually counter until all enemies are defeated.
Submitted by: AndyDark