He What?

So, here's an interesting story for you. We were on our way to the house yesterday for the inspection. We were already aware of some issues with the house, but we were a little anxious about what else he might discover. We were about half way there when Mike's phone rang. It was our realtor, A. Mike answered and then I heard A take a big breath. I thought he was going to tell us that the inspector cancelled. And then Mike kept saying, "Uh-huh, uh-huh, ok." He was using his uh-oh voice. My heart started pounding, and I was thinking, "Oh great! What now?"
WELL. Apparently, the appraisal had been done the day before. And appraiser thought he would be helpful, and turn the water on. (I bet you can already see where I'm going with this.)
He went downstairs to turn the water on. At this point, I'm not sure if he went directly back upstairs, or if he stayed in the basement for a while. But, when he did go upstairs, there was water all over the kitchen. When the sellers unhooked their fridge, they turned the main water off, but not the water line that goes to the fridge. Probably not a big deal normally, but the kitchen floor is a wood laminate. The appraiser ran back downstairs and turned the main water back off. Then, he called the seller's agent and told her to get someone over to the house to clean up the water in the kitchen. And then.....he left!!!!!! He left that puddle of water on the laminate floor. Seriously!!??? The seller's agent was busy, so she called our agent. He was busy, so he called another agent from his office, who ran over to the house and cleaned up the water. But now, the wood seams are all curled, the water has soaked up the walls of the base cabinets, and it appears that water is puddled under the cabinets where it can't be reached to dry up.
The Appraiser is trying to pass it off as no big deal. The seller is in desperate need to sell the house. We don't want to back out, but the kitchen IS damaged somewhat. And the killer is that the cabinets are on top of the flooring, so the whole kitchen would pretty much have to be completely ripped out.
We are in little bit of a dilemma. Our realtor arranged some contractors to come look at it today to give an estimate for repairs. Then we either need to go after the appraiser and his insurance, or hope that the sellers insurance is up to date so they can file a claim. If that happens, we have to then hope that the seller doesn't just take the money and run. Ugh. Our stress level just jumped into the red zone.