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@Ohmlaut
I had something very similar on my last frame. I hit the back bumper of a car that was taking off at a light and braked suddenly. Very gently - driver didnt notice and i dont think i even took my feet off the pedals (Nerwig tubing is pretty delicate, apparently). Anyway, twas enough to do similar damage to what you have there on your frame. I only noticed about 2 weeks later when i realised i had a toeverlap that I never had before.
There was a complementary bend in the top tube as well, but you wouldnt notice unless you went looking for it. I scratched the pain off the bubble to make sure there was no fissure, and used it no problems for about another 9 months, daily. It did slowly develop into a crack though, so I retired it before it killed me in the face.