Many players are amassing Critical Chance that exceeds 100% on their heroes.  With the Flamelit Sorcerer's ability adding 60% Critical Chance, that troop can quite easily exceed 100% chance as well.  Rather than this excess critical hit chance going to waste, the excess critical chance should go towards a chance for a larger critical strike.

For example: If a hero has 50% +90% Critical Damage (For a total of 240% damage dealt), and 2% +108% Critical Chance, for a total of 110% Critical Chance, then their excess would go towards a 10% chance of dealing 380% damage instead of 240%, doubling their bonus critical damage.