Well one thing is that it looks like the spot is surrounded by a dimple that is below the surrounding steel. Probably caused by being stuck too hard or having the face of the hammer come down unevenly. You can really see that on the seax. Another possibility is a high crown on the face of the hammer. I find flat faces work best and rarely use the one with the high crowned face.
You might have also hammered some scale into the surface of the steel that came out later. Maybe when you brushed it up. I guess that if you had a piece of that damascus you could clean up that spot and try to forge weld that piece into the blade and grind it level but the best thing would probably be to cut the blade shorter. I would not try to fix it with an unlike metal.
Doug
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