Very good tactic, Matt. The game forced me to try something else though... I did it by ditching the low-HP imps completely, as the enemy hero was "healing" them all the time and there was no way to prevent them from being killed. Instead, I split the Demoness stack in 2. This allows for more swaps around the battlefield, thus allowing you to kill stacks of archers safely, and get your troops out of the fray if necessary.
I love this fight. Makes you really think and get creative.
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