That's pretty scary. I've been in a few houses where the floor didn't feel structurally sound and it's not a good feeling to think that you might fall through. I feel bad for the guy. Hopefully you were able to get them a price that's actually in the ballpark of what insurance will pay. That would suck to have a house with no floor.
Ya the other contractor there was pretty shady, I mentioned that the wall was not on a joist so don't cut it out till it was supported. They did not listen and the wall came down too. Idiots.
Wow, that's pretty bad! How could they not know the wall wasn't supported? Why would they start cutting before confirming? Hopefully they were licensed, bonded, and insured.