I'd be surprised if blades that had been immersed in water would fly again. Water is bound to have got in under the skins, and then the blades would be different weights, and when you start flying them water might escape from each blade at different rates, etc. It would be an ongoing maintenance nightmare. As for the rest of it, assuming the blades were turning at or near flight RRPM, when it hit the water something must have been bent or broken.