Monty Fall problem

What do you think of it? It's just like the Monty Hall problem, but instead of the host revealing a door with a goat on purpose, he trips down and reveals a goat door by accident.

Supposedly the probability is no longer 2/3 if you switch, now it's 1/2. But should you still switch? Well it literally doesn't matter because the probability is now 1/2

Absolutely boggles my mind.