Exploit question

[Trumanator]

Used to be that if you cast it and then retreated the caster the monsters would keep coming. Therefore, if you were the defender it could be literally impossible to lose since the enemy army would hit the turn 50 autorout. Plus it let you kill all of an enemy's mindless and berserk units. All that at the cost of a few A gems and risking a mage for _one_ turn.