I'm remodeling my 2nd floor bathroom and we are in the demolition phase. My contractor's plumber accidentally turned the main water on without checking the bathroom hot/cold lines. They were not capped. Water flooded into the floor and started spilling out of the ceiling light fixtures on the 1st floor. I would say the water was on for about 60 seconds full blast. It appears there is water coming out of multiple places on the first floor.
The above video was taken about 5 minutes after the water had been turned off. I have another video showing the leak right as it happened and it shows much more water flow.
I'm assuming we should take down the drywall in any wet areas to let it dry. The plumber said it wasn't a big deal and it will dry on its own. What should I do? How bad is this?