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The Late Heavy Bombardment was followed a few billion years later by the Comparatively Light but Oddly Specific Bombardment.
Yeah, that's jsut straight up BS. I'm a Trauma Specialist and the thing that actually happens when you get hit by such a large object going at such a speed is that either stars or birds start circling around your head, accompanied by a large bump rapidly growing out of the affected area.
Also, a very common symptom is that the struck individual looses their memory. This can easily be treated by simply striking them again, with similar force.
Moral of the story, don't believe everything you read on the internet