by Kalidor
iirc from my (very fun!) demo of the 2v2 at DTC everything the deceased Mage had in play is destroyed. Wipe everything from that Mage off the board.Thematically, the Mage isn't concentrating (as he/she is dead) on keeping those enchantments or conjurations, etc around.
Hope this is right and, therefore, hope this helps! :)
Fantastic game!