Essentially soft-locked in this fight. Couldn't deal enough damage to kill the healer early because my sword was locked to two uses per fight, but if it ever attacked me it would take a ton of damage...but it never attacks.
I ran into the same issue with a pacifist build and the Frog Wizard. They never attack me and eventually I die to poison.
I guess I’m forced to reload and try for a weapon to clear this floor, and I just got the pacifist ring, too. :(