Here is a shaila (maaseh shehoya):
Erev Shabbos a cholent is cooking on a stove. A person is trying to put a piece of bread with a slice of American cheese into the microwave above the stove. The cheese falls off and hits the lid of the cholent pot which is on the fire, and then falls to the floor.
What is the status of the cholent and does the Pot need to be kashered?