Well, it has not been there too long. I would let it dry out thoroughly. Then do alittle fine sanding or even use steel wool. Then apply some stain in the area and feather it out good. Then you should be ready to go.
If there is a sealer then apply it, but since it stained, I am sure there is not one. I would consider applying a sealer to the entire flooring so this will not happen again.