From the pictures it looks to me as if the outer perimeter of the rim has been flattened for about 2 inches of the circumference. I would assume that the flat spot and nick and possible crack are all cause by a fairly hard hit. Reminds me of when I hit a railroad track at 20 mph once. If you remove the tire and tube you could confirm whether or not there is a flat spot in the rim by spinning the rim slowly adjacent to a stationary object.
It's really difficult to assess the damage (if any) via "cyber space", though the quality of the pictures is good.