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Leisesturm, Good point that one can dump speed quickly, so if one sees a car pull out in front, one might drop from 40 to 20 in a second. Perhaps even slower.
On the other hand, if a draft line goes down, it could potentially go down quickly.
The ultimate answer will depend on the stresses put on the frame, which we can't answer without knowing more details of the accident.
If it looks like the bike slid for most of the deceleration, it may well be fine. But, where is the road rash?