Cleanse the Steadfast Stone

Casting firebolt is still a somewhat effective way of defeating enemies when your mind is elsewhere.

Sometimes you hit, sometimes you don't. Just keep going.

Prior to this quest, Squeak had been petrified. The party went to complete the quest with the hope of restoring him to his previous state.

During the fight when defending the temple while it was being cleansed, Donatello tried to prevent his party members from being hit.