>Fight
The kidney stone and walking tumor take turns tackling one another, the crystalline urine cake jabbing and thrusting with its rugged thorns. The polyp is surprisingly nimble, dancing casually around every attack to rebound with a smack of its gelatinous feet to the stone's flatter, unprotected underside.
You're standing idly by...not sure whether to flee while the monster is distracted or if there's something you can do to help the spiny, giggling bladder rock. It may be disturbing, but it is trying to protect you.